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 fae4916fa..7029afd13 100644
--- a/visualc/vngspice.vcxproj
+++ b/visualc/vngspice.vcxproj
@@ -225,6 +225,7 @@
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
       <CompileAs>CompileAsC</CompileAs>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
+      <OpenMPSupport>true</OpenMPSupport>
     </ClCompile>
     <Link>
       <AdditionalDependencies>psapi.lib;KLU_COMPLEX.lib;%(AdditionalDependencies)</AdditionalDependencies>
@@ -271,6 +272,7 @@
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
       <CompileAs>CompileAsC</CompileAs>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
+      <OpenMPSupport>true</OpenMPSupport>
     </ClCompile>
     <Link>
       <AdditionalDependencies>psapi.lib;KLU_COMPLEX.lib;%(AdditionalDependencies)</AdditionalDependencies>
@@ -423,6 +425,7 @@
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
       <CompileAs>CompileAsC</CompileAs>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
+      <OpenMPSupport>true</OpenMPSupport>
     </ClCompile>
     <Link>
       <AdditionalDependencies>psapi.lib;KLU_COMPLEX.lib;%(AdditionalDependencies)</AdditionalDependencies>
@@ -469,6 +472,7 @@
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
       <CompileAs>CompileAsC</CompileAs>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
+      <OpenMPSupport>true</OpenMPSupport>
     </ClCompile>
     <Link>
       <AdditionalDependencies>psapi.lib;KLU_COMPLEX.lib;%(AdditionalDependencies)</AdditionalDependencies>