diff --git a/include/ucore/atomic.h b/include/ucore/atomic.h
index c5bbe1d..1d7184d 100644
--- a/include/ucore/atomic.h
+++ b/include/ucore/atomic.h
@@ -20,7 +20,7 @@
  * Atomically decrement *ptr
  * @return *ptr before the decrement
  */
-#define UC_ATOMIC_DEC(ptr) UC_ATOMIC_ADD((ptr), -1)
+#define UC_ATOMIC_DEC(ptr) UC_ATOMIC_SUB((ptr), 1)
 
 /**
  * Atomically increment *ptr