diff --git a/PCbuild/_ctypes.vcproj b/PCbuild/_ctypes.vcproj
index f303c2128796..76518e69530a 100644
--- a/PCbuild/_ctypes.vcproj
+++ b/PCbuild/_ctypes.vcproj
@@ -26,7 +26,7 @@
 				RuntimeLibrary="3"
 				UsePrecompiledHeader="0"
 				WarningLevel="3"
-				Detect64BitPortabilityProblems="TRUE"
+				Detect64BitPortabilityProblems="FALSE"
 				DebugInformationFormat="3"
 				CompileAs="0"/>
 			<Tool
@@ -78,7 +78,7 @@
 				EnableFunctionLevelLinking="TRUE"
 				UsePrecompiledHeader="0"
 				WarningLevel="3"
-				Detect64BitPortabilityProblems="TRUE"
+				Detect64BitPortabilityProblems="FALSE"
 				DebugInformationFormat="0"
 				CompileAs="0"/>
 			<Tool