diff --git a/externals/ace/win/VC90/ace.vcproj b/externals/ace/win/VC90/ace.vcproj
index 35ae4149a81..f54385fbd7a 100644
--- a/externals/ace/win/VC90/ace.vcproj
+++ b/externals/ace/win/VC90/ace.vcproj
@@ -488,6 +488,22 @@
 						CompileAs="2"
 					/>
 				</FileConfiguration>
+				<FileConfiguration
+					Name="Debug|x64"
+					>
+					<Tool
+						Name="VCCLCompilerTool"
+						CompileAs="2"
+					/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="Release|x64"
+					>
+					<Tool
+						Name="VCCLCompilerTool"
+						CompileAs="2"
+					/>
+				</FileConfiguration>
 			</File>
 			<File
 				RelativePath="..\..\Auto_Event.cpp"
@@ -1276,6 +1292,22 @@
 						CompileAs="2"
 					/>
 				</FileConfiguration>
+				<FileConfiguration
+					Name="Debug|x64"
+					>
+					<Tool
+						Name="VCCLCompilerTool"
+						CompileAs="2"
+					/>
+				</FileConfiguration>
+				<FileConfiguration
+					Name="Release|x64"
+					>
+					<Tool
+						Name="VCCLCompilerTool"
+						CompileAs="2"
+					/>
+				</FileConfiguration>
 			</File>
 			<File
 				RelativePath="..\..\RW_Mutex.cpp"