diff --git a/cryptdll.vcxproj b/cryptdll.vcxproj
index 73d775bc..f2c13780 100644
--- a/cryptdll.vcxproj
+++ b/cryptdll.vcxproj
@@ -62,7 +62,7 @@
       <SuppressStartupBanner>true</SuppressStartupBanner>
       <ErrorReporting>None</ErrorReporting>
       <WarningLevel>Level4</WarningLevel>
-      <DisableSpecificWarnings>4231; 4355; 4505</DisableSpecificWarnings>
+      <DisableSpecificWarnings>4231; 4251; 4275; 4355; 4505</DisableSpecificWarnings>
       <PrecompiledHeader>Use</PrecompiledHeader>
       <PrecompiledHeaderFile>pch.h</PrecompiledHeaderFile>
     </ClCompile>
diff --git a/cryptest.vcxproj b/cryptest.vcxproj
index 15ab2a5a..45fc0072 100644
--- a/cryptest.vcxproj
+++ b/cryptest.vcxproj
@@ -92,7 +92,7 @@
       <SuppressStartupBanner>true</SuppressStartupBanner>
       <ErrorReporting>None</ErrorReporting>
       <WarningLevel>Level4</WarningLevel>
-      <DisableSpecificWarnings>4231; 4355; 4505</DisableSpecificWarnings>
+      <DisableSpecificWarnings>4231; 4251; 4275; 4355; 4505</DisableSpecificWarnings>
       <PrecompiledHeader />
       <PrecompiledHeadeFile />
     </ClCompile>
diff --git a/cryptlib.vcxproj b/cryptlib.vcxproj
index 77fec91a..aa4ff2d3 100644
--- a/cryptlib.vcxproj
+++ b/cryptlib.vcxproj
@@ -92,7 +92,7 @@
       <SuppressStartupBanner>true</SuppressStartupBanner>
       <ErrorReporting>None</ErrorReporting>
       <WarningLevel>Level4</WarningLevel>
-      <DisableSpecificWarnings>4231; 4355; 4505</DisableSpecificWarnings>
+      <DisableSpecificWarnings>4231; 4251; 4275; 4355; 4505</DisableSpecificWarnings>
       <PrecompiledHeader>Use</PrecompiledHeader>
       <PrecompiledHeaderFile>pch.h</PrecompiledHeaderFile>
     </ClCompile>
diff --git a/dlltest.vcxproj b/dlltest.vcxproj
index 7ad5d0a6..b76d184a 100644
--- a/dlltest.vcxproj
+++ b/dlltest.vcxproj
@@ -60,7 +60,7 @@
       <SuppressStartupBanner>true</SuppressStartupBanner>
       <ErrorReporting>None</ErrorReporting>
       <WarningLevel>Level4</WarningLevel>
-      <DisableSpecificWarnings>4231; 4355; 4505</DisableSpecificWarnings>
+      <DisableSpecificWarnings>4231; 4251; 4275; 4355; 4505</DisableSpecificWarnings>
       <CallingConvention>StdCall</CallingConvention>
       <PrecompiledHeader />
     </ClCompile>