diff --git a/visualc/KLU/KLU_COMPLEX.vcxproj b/visualc/KLU/KLU_COMPLEX.vcxproj
index c64bb5fb9..3c97cedc2 100644
--- a/visualc/KLU/KLU_COMPLEX.vcxproj
+++ b/visualc/KLU/KLU_COMPLEX.vcxproj
@@ -79,6 +79,7 @@
       <WarningLevel>Level4</WarningLevel>
       <DebugInformationFormat>EditAndContinue</DebugInformationFormat>
       <CompileAs>CompileAsC</CompileAs>
+      <OpenMPSupport>true</OpenMPSupport>
     </ClCompile>
   </ItemDefinitionGroup>
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
diff --git a/visualc/vngspice.vcxproj b/visualc/vngspice.vcxproj
index d7a00807c..3dca9ad34 100644
--- a/visualc/vngspice.vcxproj
+++ b/visualc/vngspice.vcxproj
@@ -219,6 +219,7 @@
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
       <CompileAs>CompileAsC</CompileAs>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
+      <OpenMPSupport>true</OpenMPSupport>
     </ClCompile>
     <Link>
       <AdditionalDependencies>psapi.lib;KLU_COMPLEX.lib;%(AdditionalDependencies)</AdditionalDependencies>
@@ -262,6 +263,7 @@
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
       <CompileAs>CompileAsC</CompileAs>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
+      <OpenMPSupport>true</OpenMPSupport>
     </ClCompile>
     <Link>
       <AdditionalDependencies>psapi.lib;KLU_COMPLEX.lib;%(AdditionalDependencies)</AdditionalDependencies>
@@ -405,6 +407,7 @@
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
       <CompileAs>CompileAsC</CompileAs>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
+      <OpenMPSupport>true</OpenMPSupport>
     </ClCompile>
     <Link>
       <AdditionalDependencies>psapi.lib;KLU_COMPLEX.lib;%(AdditionalDependencies)</AdditionalDependencies>
@@ -448,6 +451,7 @@
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
       <CompileAs>CompileAsC</CompileAs>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
+      <OpenMPSupport>true</OpenMPSupport>
     </ClCompile>
     <Link>
       <AdditionalDependencies>psapi.lib;KLU_COMPLEX.lib;%(AdditionalDependencies)</AdditionalDependencies>