diff --git a/include/ucore/saturating_math.h b/include/ucore/saturating_math.h
index 7b05905..f870222 100644
--- a/include/ucore/saturating_math.h
+++ b/include/ucore/saturating_math.h
@@ -8,7 +8,7 @@
 ((type)((a) + (b)) >= (a) ? (a) + (b) : (max_val))
 
 #define UC_SAT_SUB(a, b)\
-(a >= b ? (a) - (b) : 0)
+((a) >= (b) ? (a) - (b) : 0)
 
 #define UC_SAT_MULT(a, b, type, max_val)\
 ((b) == 0 ? 0 :\