diff --git a/common.h b/common.h
index 9d73bc548..b38f830d1 100644
--- a/common.h
+++ b/common.h
@@ -38,7 +38,7 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 
 //============================================================================
 
-#define ContainerOf(ptr, type, member) (type *)((void *)&(ptr) - offsetof(type, member))
+#define ContainerOf(ptr, type, member) ((type *)((void *)&(ptr) - offsetof(type, member)))
 
 typedef struct sizebuf_s
 {