diff --git a/visualc/vngspice-fftw.vcxproj b/visualc/vngspice-fftw.vcxproj
index b4517fa76..a457aa004 100644
--- a/visualc/vngspice-fftw.vcxproj
+++ b/visualc/vngspice-fftw.vcxproj
@@ -263,7 +263,7 @@ lib /machine:x86 /def:..\..\fftw-3.3.4-dll32\libfftw3-3.def /out:$(IntDir)libfft
       <RuntimeTypeInfo>true</RuntimeTypeInfo>
       <PrecompiledHeader>
       </PrecompiledHeader>
-      <WarningLevel>Level3</WarningLevel>
+      <WarningLevel>Level4</WarningLevel>
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
       <CompileAs>CompileAsC</CompileAs>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
@@ -363,7 +363,7 @@ lib /machine:x64 /def:..\..\fftw-3.3.4-dll64\libfftw3-3.def /out:$(IntDir)libfft
       <RuntimeTypeInfo>false</RuntimeTypeInfo>
       <PrecompiledHeader>
       </PrecompiledHeader>
-      <WarningLevel>Level3</WarningLevel>
+      <WarningLevel>Level4</WarningLevel>
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
       <CompileAs>CompileAsC</CompileAs>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
@@ -459,7 +459,7 @@ lib /machine:x86 /def:..\..\fftw-3.3.4-dll32\libfftw3-3.def /out:$(IntDir)libfft
       <RuntimeTypeInfo>true</RuntimeTypeInfo>
       <PrecompiledHeader>
       </PrecompiledHeader>
-      <WarningLevel>Level3</WarningLevel>
+      <WarningLevel>Level4</WarningLevel>
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
       <CompileAs>CompileAsC</CompileAs>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
@@ -559,7 +559,7 @@ lib /machine:x64 /def:..\..\fftw-3.3.4-dll64\libfftw3-3.def /out:$(IntDir)libfft
       <RuntimeTypeInfo>true</RuntimeTypeInfo>
       <PrecompiledHeader>
       </PrecompiledHeader>
-      <WarningLevel>Level3</WarningLevel>
+      <WarningLevel>Level4</WarningLevel>
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
       <CompileAs>CompileAsC</CompileAs>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
@@ -610,7 +610,7 @@ lib /machine:x86 /def:..\..\fftw-3.3.4-dll32\libfftw3-3.def /out:$(IntDir)libfft
       <OpenMPSupport>true</OpenMPSupport>
       <PrecompiledHeader>
       </PrecompiledHeader>
-      <WarningLevel>Level3</WarningLevel>
+      <WarningLevel>Level4</WarningLevel>
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
       <CompileAs>CompileAsC</CompileAs>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
@@ -664,7 +664,7 @@ lib /machine:x64 /def:..\..\fftw-3.3.4-dll64\libfftw3-3.def /out:$(IntDir)libfft
       <OpenMPSupport>true</OpenMPSupport>
       <PrecompiledHeader>
       </PrecompiledHeader>
-      <WarningLevel>Level3</WarningLevel>
+      <WarningLevel>Level4</WarningLevel>
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
       <CompileAs>CompileAsC</CompileAs>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
@@ -717,7 +717,7 @@ lib /machine:x86 /def:..\..\fftw-3.3.4-dll32\libfftw3-3.def /out:$(IntDir)libfft
       <OpenMPSupport>true</OpenMPSupport>
       <PrecompiledHeader>
       </PrecompiledHeader>
-      <WarningLevel>Level3</WarningLevel>
+      <WarningLevel>Level4</WarningLevel>
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
       <CompileAs>CompileAsC</CompileAs>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
@@ -771,7 +771,7 @@ lib /machine:x64 /def:..\..\fftw-3.3.4-dll64\libfftw3-3.def /out:$(IntDir)libfft
       <OpenMPSupport>true</OpenMPSupport>
       <PrecompiledHeader>
       </PrecompiledHeader>
-      <WarningLevel>Level3</WarningLevel>
+      <WarningLevel>Level4</WarningLevel>
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
       <CompileAs>CompileAsC</CompileAs>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
diff --git a/visualc/vngspice.vcxproj b/visualc/vngspice.vcxproj
index f8b777083..12ccb8e4e 100644
--- a/visualc/vngspice.vcxproj
+++ b/visualc/vngspice.vcxproj
@@ -258,7 +258,7 @@
       <RuntimeTypeInfo>true</RuntimeTypeInfo>
       <PrecompiledHeader>
       </PrecompiledHeader>
-      <WarningLevel>Level3</WarningLevel>
+      <WarningLevel>Level4</WarningLevel>
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
       <CompileAs>CompileAsC</CompileAs>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
@@ -354,7 +354,7 @@
       <RuntimeTypeInfo>false</RuntimeTypeInfo>
       <PrecompiledHeader>
       </PrecompiledHeader>
-      <WarningLevel>Level3</WarningLevel>
+      <WarningLevel>Level4</WarningLevel>
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
       <CompileAs>CompileAsC</CompileAs>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
@@ -444,7 +444,7 @@
       <RuntimeTypeInfo>true</RuntimeTypeInfo>
       <PrecompiledHeader>
       </PrecompiledHeader>
-      <WarningLevel>Level3</WarningLevel>
+      <WarningLevel>Level4</WarningLevel>
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
       <CompileAs>CompileAsC</CompileAs>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
@@ -538,7 +538,7 @@
       <RuntimeTypeInfo>true</RuntimeTypeInfo>
       <PrecompiledHeader>
       </PrecompiledHeader>
-      <WarningLevel>Level3</WarningLevel>
+      <WarningLevel>Level4</WarningLevel>
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
       <CompileAs>CompileAsC</CompileAs>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
@@ -587,7 +587,7 @@
       <OpenMPSupport>true</OpenMPSupport>
       <PrecompiledHeader>
       </PrecompiledHeader>
-      <WarningLevel>Level3</WarningLevel>
+      <WarningLevel>Level4</WarningLevel>
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
       <CompileAs>CompileAsC</CompileAs>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
@@ -637,7 +637,7 @@
       <OpenMPSupport>true</OpenMPSupport>
       <PrecompiledHeader>
       </PrecompiledHeader>
-      <WarningLevel>Level3</WarningLevel>
+      <WarningLevel>Level4</WarningLevel>
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
       <CompileAs>CompileAsC</CompileAs>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
@@ -688,7 +688,7 @@
       <OpenMPSupport>true</OpenMPSupport>
       <PrecompiledHeader>
       </PrecompiledHeader>
-      <WarningLevel>Level3</WarningLevel>
+      <WarningLevel>Level4</WarningLevel>
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
       <CompileAs>CompileAsC</CompileAs>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
@@ -738,7 +738,7 @@
       <OpenMPSupport>true</OpenMPSupport>
       <PrecompiledHeader>
       </PrecompiledHeader>
-      <WarningLevel>Level3</WarningLevel>
+      <WarningLevel>Level4</WarningLevel>
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
       <CompileAs>CompileAsC</CompileAs>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
diff --git a/visualc/xspice/analog.vcxproj b/visualc/xspice/analog.vcxproj
index 09ccb51dd..d3cc93bdb 100644
--- a/visualc/xspice/analog.vcxproj
+++ b/visualc/xspice/analog.vcxproj
@@ -130,7 +130,7 @@
       </ExceptionHandling>
       <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
       <FunctionLevelLinking>true</FunctionLevelLinking>
-      <WarningLevel>Level3</WarningLevel>
+      <WarningLevel>Level4</WarningLevel>
       <DebugInformationFormat>None</DebugInformationFormat>
       <CompileAs>CompileAsC</CompileAs>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
@@ -189,7 +189,7 @@
       </ExceptionHandling>
       <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
       <FunctionLevelLinking>true</FunctionLevelLinking>
-      <WarningLevel>Level3</WarningLevel>
+      <WarningLevel>Level4</WarningLevel>
       <DebugInformationFormat>None</DebugInformationFormat>
       <CompileAs>CompileAsC</CompileAs>
     </ClCompile>
diff --git a/visualc/xspice/cmpp/cmpp.vcxproj b/visualc/xspice/cmpp/cmpp.vcxproj
index 65b0b210f..1e3512a8d 100644
--- a/visualc/xspice/cmpp/cmpp.vcxproj
+++ b/visualc/xspice/cmpp/cmpp.vcxproj
@@ -71,7 +71,7 @@
   <PropertyGroup />
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
     <ClCompile>
-      <WarningLevel>Level3</WarningLevel>
+      <WarningLevel>Level4</WarningLevel>
       <Optimization>Disabled</Optimization>
       <PreprocessorDefinitions>_CRT_SECURE_NO_WARNINGS;YY_NO_UNISTD_H;_CRT_NONSTDC_NO_DEPRECATE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <ExceptionHandling>false</ExceptionHandling>
@@ -87,7 +87,7 @@
   </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
     <ClCompile>
-      <WarningLevel>Level3</WarningLevel>
+      <WarningLevel>Level4</WarningLevel>
       <Optimization>MaxSpeed</Optimization>
       <FunctionLevelLinking>true</FunctionLevelLinking>
       <IntrinsicFunctions>true</IntrinsicFunctions>
@@ -109,7 +109,7 @@
   </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
     <ClCompile>
-      <WarningLevel>Level3</WarningLevel>
+      <WarningLevel>Level4</WarningLevel>
       <Optimization>Disabled</Optimization>
       <SDLCheck>true</SDLCheck>
       <PreprocessorDefinitions>_CRT_SECURE_NO_WARNINGS;YY_NO_UNISTD_H;_CRT_NONSTDC_NO_DEPRECATE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
@@ -125,7 +125,7 @@
   </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
     <ClCompile>
-      <WarningLevel>Level3</WarningLevel>
+      <WarningLevel>Level4</WarningLevel>
       <Optimization>MaxSpeed</Optimization>
       <FunctionLevelLinking>true</FunctionLevelLinking>
       <IntrinsicFunctions>true</IntrinsicFunctions>
diff --git a/visualc/xspice/digital.vcxproj b/visualc/xspice/digital.vcxproj
index ce1c4c656..a5e11add0 100644
--- a/visualc/xspice/digital.vcxproj
+++ b/visualc/xspice/digital.vcxproj
@@ -130,7 +130,7 @@
       </ExceptionHandling>
       <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
       <FunctionLevelLinking>true</FunctionLevelLinking>
-      <WarningLevel>Level3</WarningLevel>
+      <WarningLevel>Level4</WarningLevel>
       <DebugInformationFormat>None</DebugInformationFormat>
       <CompileAs>CompileAsC</CompileAs>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
@@ -189,7 +189,7 @@
       </ExceptionHandling>
       <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
       <FunctionLevelLinking>true</FunctionLevelLinking>
-      <WarningLevel>Level3</WarningLevel>
+      <WarningLevel>Level4</WarningLevel>
       <DebugInformationFormat>None</DebugInformationFormat>
       <CompileAs>CompileAsC</CompileAs>
     </ClCompile>
diff --git a/visualc/xspice/spice2poly.vcxproj b/visualc/xspice/spice2poly.vcxproj
index e9bb7d57d..66e963b22 100644
--- a/visualc/xspice/spice2poly.vcxproj
+++ b/visualc/xspice/spice2poly.vcxproj
@@ -130,7 +130,7 @@
       </ExceptionHandling>
       <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
       <FunctionLevelLinking>true</FunctionLevelLinking>
-      <WarningLevel>Level3</WarningLevel>
+      <WarningLevel>Level4</WarningLevel>
       <DebugInformationFormat>None</DebugInformationFormat>
       <CompileAs>CompileAsC</CompileAs>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
@@ -189,7 +189,7 @@
       </ExceptionHandling>
       <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
       <FunctionLevelLinking>true</FunctionLevelLinking>
-      <WarningLevel>Level3</WarningLevel>
+      <WarningLevel>Level4</WarningLevel>
       <DebugInformationFormat>None</DebugInformationFormat>
       <CompileAs>CompileAsC</CompileAs>
     </ClCompile>
diff --git a/visualc/xspice/xtradev.vcxproj b/visualc/xspice/xtradev.vcxproj
index bd115f7b4..6508d6f6e 100644
--- a/visualc/xspice/xtradev.vcxproj
+++ b/visualc/xspice/xtradev.vcxproj
@@ -130,7 +130,7 @@
       </ExceptionHandling>
       <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
       <FunctionLevelLinking>true</FunctionLevelLinking>
-      <WarningLevel>Level3</WarningLevel>
+      <WarningLevel>Level4</WarningLevel>
       <DebugInformationFormat>None</DebugInformationFormat>
       <CompileAs>CompileAsC</CompileAs>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
@@ -189,7 +189,7 @@
       </ExceptionHandling>
       <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
       <FunctionLevelLinking>true</FunctionLevelLinking>
-      <WarningLevel>Level3</WarningLevel>
+      <WarningLevel>Level4</WarningLevel>
       <DebugInformationFormat>None</DebugInformationFormat>
       <CompileAs>CompileAsC</CompileAs>
     </ClCompile>
diff --git a/visualc/xspice/xtraevt.vcxproj b/visualc/xspice/xtraevt.vcxproj
index da7656b74..8b3699013 100644
--- a/visualc/xspice/xtraevt.vcxproj
+++ b/visualc/xspice/xtraevt.vcxproj
@@ -131,7 +131,7 @@ call .\aux-udnfunc.bat $(ProjectName)</Command>
       </ExceptionHandling>
       <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
       <FunctionLevelLinking>true</FunctionLevelLinking>
-      <WarningLevel>Level3</WarningLevel>
+      <WarningLevel>Level4</WarningLevel>
       <DebugInformationFormat>None</DebugInformationFormat>
       <CompileAs>CompileAsC</CompileAs>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
@@ -190,7 +190,7 @@ call .\aux-udnfunc.bat $(ProjectName)</Command>
       </ExceptionHandling>
       <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
       <FunctionLevelLinking>true</FunctionLevelLinking>
-      <WarningLevel>Level3</WarningLevel>
+      <WarningLevel>Level4</WarningLevel>
       <DebugInformationFormat>None</DebugInformationFormat>
       <CompileAs>CompileAsC</CompileAs>
     </ClCompile>