diff --git a/cryptdll.vcxproj b/cryptdll.vcxproj
index 14b4d40f..df5a4787 100644
--- a/cryptdll.vcxproj
+++ b/cryptdll.vcxproj
@@ -65,6 +65,7 @@
       <DisableSpecificWarnings>4231; 4251; 4275; 4355; 4505</DisableSpecificWarnings>
       <PrecompiledHeader>Use</PrecompiledHeader>
       <PrecompiledHeaderFile>pch.h</PrecompiledHeaderFile>
+      <AdditionalOptions>$(AdditionalOptions)</AdditionalOptions>
     </ClCompile>
     <Link>
       <ErrorReporting>NoErrorReport</ErrorReporting>
diff --git a/cryptest.vcxproj b/cryptest.vcxproj
index 72dfad26..6afe2a23 100644
--- a/cryptest.vcxproj
+++ b/cryptest.vcxproj
@@ -95,6 +95,7 @@
       <DisableSpecificWarnings>4231; 4251; 4275; 4355; 4505</DisableSpecificWarnings>
       <PrecompiledHeader />
       <PrecompiledHeadeFile />
+      <AdditionalOptions>$(AdditionalOptions)</AdditionalOptions>
     </ClCompile>
     <Link>
       <ErrorReporting>NoErrorReport</ErrorReporting>
diff --git a/cryptlib.vcxproj b/cryptlib.vcxproj
index f57d8fe1..f58950f4 100644
--- a/cryptlib.vcxproj
+++ b/cryptlib.vcxproj
@@ -95,6 +95,7 @@
       <DisableSpecificWarnings>4231; 4251; 4275; 4355; 4505</DisableSpecificWarnings>
       <PrecompiledHeader>Use</PrecompiledHeader>
       <PrecompiledHeaderFile>pch.h</PrecompiledHeaderFile>
+      <AdditionalOptions>$(AdditionalOptions)</AdditionalOptions>
     </ClCompile>
     <Lib>
       <ErrorReporting>NoErrorReport</ErrorReporting>
diff --git a/dlltest.vcxproj b/dlltest.vcxproj
index b76d184a..6a4a94ab 100644
--- a/dlltest.vcxproj
+++ b/dlltest.vcxproj
@@ -63,6 +63,7 @@
       <DisableSpecificWarnings>4231; 4251; 4275; 4355; 4505</DisableSpecificWarnings>
       <CallingConvention>StdCall</CallingConvention>
       <PrecompiledHeader />
+      <AdditionalOptions>$(AdditionalOptions)</AdditionalOptions>
     </ClCompile>
     <Link>
       <ErrorReporting>NoErrorReport</ErrorReporting>