diff --git a/engine/common/common.h b/engine/common/common.h
index 5c210fc5..32042092 100644
--- a/engine/common/common.h
+++ b/engine/common/common.h
@@ -103,6 +103,10 @@ XASH SPECIFIC			- sort of hack that works only in Xash3D not in GoldSrc
 #define FBitSet( iBitVector, bit )	((iBitVector) & (bit))
 
 #ifndef __cplusplus
+#ifdef NULL
+#undef NULL
+#endif
+
 #define NULL		((void *)0)
 #endif