diff --git a/aegisub/universalchardet/universalcharset_2008.vcproj b/aegisub/universalchardet/universalcharset_2008.vcproj
index 8586e3956..6048aef9d 100644
--- a/aegisub/universalchardet/universalcharset_2008.vcproj
+++ b/aegisub/universalchardet/universalcharset_2008.vcproj
@@ -49,7 +49,6 @@
 				RuntimeLibrary="3"
 				UsePrecompiledHeader="0"
 				WarningLevel="3"
-				Detect64BitPortabilityProblems="true"
 				DebugInformationFormat="4"
 			/>
 			<Tool
@@ -111,7 +110,6 @@
 				RuntimeLibrary="3"
 				UsePrecompiledHeader="0"
 				WarningLevel="3"
-				Detect64BitPortabilityProblems="true"
 				DebugInformationFormat="3"
 			/>
 			<Tool
@@ -170,7 +168,6 @@
 				RuntimeLibrary="2"
 				UsePrecompiledHeader="0"
 				WarningLevel="3"
-				Detect64BitPortabilityProblems="true"
 				DebugInformationFormat="3"
 			/>
 			<Tool
@@ -230,7 +227,6 @@
 				RuntimeLibrary="2"
 				UsePrecompiledHeader="0"
 				WarningLevel="3"
-				Detect64BitPortabilityProblems="true"
 				DebugInformationFormat="3"
 			/>
 			<Tool