diff --git a/win/jpeglib/jpeglib.vcxproj b/win/jpeglib/jpeglib.vcxproj
index fb7ff3df..f4509221 100644
--- a/win/jpeglib/jpeglib.vcxproj
+++ b/win/jpeglib/jpeglib.vcxproj
@@ -52,6 +52,11 @@
       <GenerateDebugInformation>true</GenerateDebugInformation>
     </Link>
   </ItemDefinitionGroup>
+  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'">
+    <ClCompile>
+      <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
+    </ClCompile>
+  </ItemDefinitionGroup>
   <ItemGroup>
     <ClCompile Include="jaricom.c" />
     <ClCompile Include="jcapimin.c" />
diff --git a/win/libpng/libpng.vcxproj b/win/libpng/libpng.vcxproj
index 7a3e173e..3b5e2073 100644
--- a/win/libpng/libpng.vcxproj
+++ b/win/libpng/libpng.vcxproj
@@ -68,6 +68,7 @@
       <IntrinsicFunctions>true</IntrinsicFunctions>
       <PreprocessorDefinitions>WIN32;NDEBUG;_LIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <AdditionalIncludeDirectories>../zlib</AdditionalIncludeDirectories>
+      <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
     </ClCompile>
     <Link>
       <SubSystem>Windows</SubSystem>