diff --git a/reactos/tools/rbuild/backend/mingw/modulehandler.cpp b/reactos/tools/rbuild/backend/mingw/modulehandler.cpp
index 11e9bb07722..a827b8ade35 100644
--- a/reactos/tools/rbuild/backend/mingw/modulehandler.cpp
+++ b/reactos/tools/rbuild/backend/mingw/modulehandler.cpp
@@ -2550,7 +2550,7 @@ MingwIsoModuleHandler::GenerateIsoModuleTarget ()
 		backend->outputDirectory );
 	string bootcdReactosNoFixup = bootcdDirectory + SSEP "reactos";
 	string bootcdReactos = PassThruCacheDirectory (
-		NormalizeFilename ( bootcdReactosNoFixup ) + SSEP,
+		NormalizeFilename ( bootcdReactosNoFixup + SSEP ),
 		backend->outputDirectory );
 	CLEAN_FILE ( bootcdReactos );
 	string reactosInf = PassThruCacheDirectory (