diff --git a/idlib/math/Matrix.h b/idlib/math/Matrix.h
index 785ac8f..4a8935a 100644
--- a/idlib/math/Matrix.h
+++ b/idlib/math/Matrix.h
@@ -34,6 +34,12 @@ If you have questions concerning this license or the applicable additional terms
  #include <malloc.h>
 #endif
 
+#ifdef _MSC_VER // DG: I don't care if matrix code has some unused r variable only used for assertions, shut up VS
+#pragma warning( push )
+#pragma warning( disable : 4189 )
+#endif
+
+
 /*
 ===============================================================================
 
@@ -2946,4 +2952,8 @@ ID_INLINE float *idMatX::ToFloatPtr( void ) {
 	return mat;
 }
 
+#ifdef _MSC_VER // DG: re-enable warning 4189
+#pragma warning( pop )
+#endif
+
 #endif /* !__MATH_MATRIX_H__ */