diff --git a/visualc/vngspice_fftw.vcxproj b/visualc/vngspice_fftw.vcxproj
index 3c9391520..36b6cf6ab 100644
--- a/visualc/vngspice_fftw.vcxproj
+++ b/visualc/vngspice_fftw.vcxproj
@@ -227,6 +227,7 @@
       <WarningLevel>Level4</WarningLevel>
       <DebugInformationFormat>EditAndContinue</DebugInformationFormat>
       <CompileAs>CompileAsC</CompileAs>
+      <MultiProcessorCompilation>true</MultiProcessorCompilation>
     </ClCompile>
     <Link>
       <AdditionalDependencies>psapi.lib;libfftw3-3.lib;%(AdditionalDependencies)</AdditionalDependencies>
@@ -277,6 +278,7 @@
       <WarningLevel>Level4</WarningLevel>
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
       <CompileAs>CompileAsC</CompileAs>
+      <MultiProcessorCompilation>true</MultiProcessorCompilation>
     </ClCompile>
     <Link>
       <AdditionalDependencies>psapi.lib;libfftw3-3.lib;%(AdditionalDependencies)</AdditionalDependencies>
@@ -327,6 +329,7 @@
       <WarningLevel>Level3</WarningLevel>
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
       <CompileAs>CompileAsC</CompileAs>
+      <MultiProcessorCompilation>true</MultiProcessorCompilation>
     </ClCompile>
     <Link>
       <AdditionalDependencies>psapi.lib;libfftw3-3.lib;%(AdditionalDependencies)</AdditionalDependencies>
@@ -382,6 +385,7 @@
       <WarningLevel>Level3</WarningLevel>
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
       <CompileAs>CompileAsC</CompileAs>
+      <MultiProcessorCompilation>true</MultiProcessorCompilation>
     </ClCompile>
     <Link>
       <AdditionalDependencies>psapi.lib;libfftw3-3.lib;%(AdditionalDependencies)</AdditionalDependencies>
@@ -433,6 +437,7 @@
       <WarningLevel>Level4</WarningLevel>
       <DebugInformationFormat>EditAndContinue</DebugInformationFormat>
       <CompileAs>CompileAsC</CompileAs>
+      <MultiProcessorCompilation>true</MultiProcessorCompilation>
     </ClCompile>
     <Link>
       <AdditionalDependencies>psapi.lib;libfftw3-3.lib;%(AdditionalDependencies)</AdditionalDependencies>
@@ -482,6 +487,7 @@
       <WarningLevel>Level4</WarningLevel>
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
       <CompileAs>CompileAsC</CompileAs>
+      <MultiProcessorCompilation>true</MultiProcessorCompilation>
     </ClCompile>
     <Link>
       <AdditionalDependencies>psapi.lib;libfftw3-3.lib;%(AdditionalDependencies)</AdditionalDependencies>
@@ -531,6 +537,7 @@
       <WarningLevel>Level3</WarningLevel>
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
       <CompileAs>CompileAsC</CompileAs>
+      <MultiProcessorCompilation>true</MultiProcessorCompilation>
     </ClCompile>
     <Link>
       <AdditionalDependencies>psapi.lib;libfftw3-3.lib;%(AdditionalDependencies)</AdditionalDependencies>
@@ -586,6 +593,7 @@
       <WarningLevel>Level3</WarningLevel>
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
       <CompileAs>CompileAsC</CompileAs>
+      <MultiProcessorCompilation>true</MultiProcessorCompilation>
     </ClCompile>
     <Link>
       <AdditionalDependencies>psapi.lib;libfftw3-3.lib;%(AdditionalDependencies)</AdditionalDependencies>
@@ -639,6 +647,7 @@
       <WarningLevel>Level3</WarningLevel>
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
       <CompileAs>CompileAsC</CompileAs>
+      <MultiProcessorCompilation>true</MultiProcessorCompilation>
     </ClCompile>
     <Link>
       <AdditionalDependencies>psapi.lib;libfftw3-3.lib;%(AdditionalDependencies)</AdditionalDependencies>
@@ -695,6 +704,7 @@
       <WarningLevel>Level3</WarningLevel>
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
       <CompileAs>CompileAsC</CompileAs>
+      <MultiProcessorCompilation>true</MultiProcessorCompilation>
     </ClCompile>
     <Link>
       <AdditionalDependencies>psapi.lib;libfftw3-3.lib;%(AdditionalDependencies)</AdditionalDependencies>
@@ -750,6 +760,7 @@
       <WarningLevel>Level3</WarningLevel>
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
       <CompileAs>CompileAsC</CompileAs>
+      <MultiProcessorCompilation>true</MultiProcessorCompilation>
     </ClCompile>
     <Link>
       <AdditionalDependencies>psapi.lib;libfftw3-3.lib;%(AdditionalDependencies)</AdditionalDependencies>
@@ -805,6 +816,7 @@
       <WarningLevel>Level3</WarningLevel>
       <DebugInformationFormat>ProgramDatabase</DebugInformationFormat>
       <CompileAs>CompileAsC</CompileAs>
+      <MultiProcessorCompilation>true</MultiProcessorCompilation>
     </ClCompile>
     <Link>
       <AdditionalDependencies>psapi.lib;libfftw3-3.lib;%(AdditionalDependencies)</AdditionalDependencies>