diff --git a/include/common/tmsg.h b/include/common/tmsg.h
index 1781374165..c0ac7da5bf 100644
--- a/include/common/tmsg.h
+++ b/include/common/tmsg.h
@@ -218,7 +218,7 @@ typedef struct SEp {
 
 #define SHOW_REWRITE_MASK() (1 << 0)
 
-#define TEST_SHOW_REWRITE_MASK(m) ((m) & SHOW_REWRITE_MASK() != 0)
+#define TEST_SHOW_REWRITE_MASK(m) (((m) & SHOW_REWRITE_MASK()) != 0)
 
 typedef struct {
   int32_t contLen;