diff --git a/reactos/tools/rbuild/backend/msvc/msvcmaker.cpp b/reactos/tools/rbuild/backend/msvc/msvcmaker.cpp
index 364d20a91ee..0b359b0247a 100644
--- a/reactos/tools/rbuild/backend/msvc/msvcmaker.cpp
+++ b/reactos/tools/rbuild/backend/msvc/msvcmaker.cpp
@@ -31,6 +31,10 @@
 using std::string;
 using std::vector;
 
+#ifdef OUT
+#undef OUT
+#endif//OUT
+
 void
 MSVCBackend::_generate_dsp ( const Module& module )
 {
diff --git a/reactos/tools/rbuild/backend/msvc/vcprojmaker.cpp b/reactos/tools/rbuild/backend/msvc/vcprojmaker.cpp
index fe8fc94bc3f..8ac3a25d35c 100644
--- a/reactos/tools/rbuild/backend/msvc/vcprojmaker.cpp
+++ b/reactos/tools/rbuild/backend/msvc/vcprojmaker.cpp
@@ -31,6 +31,10 @@
 using std::string;
 using std::vector;
 
+#ifdef OUT
+#undef OUT
+#endif//OUT
+
 void
 MSVCBackend::_generate_vcproj ( const Module& module )
 {