diff --git a/include/ucore/atomic.h b/include/ucore/atomic.h
index a3b4a67..7d7821e 100644
--- a/include/ucore/atomic.h
+++ b/include/ucore/atomic.h
@@ -8,17 +8,18 @@
 
 #ifdef __GNUC__
 
+/**
+ * Atomically subtract val from *ptr
+ * @return *ptr before the subtraction
+ */
+#define UC_ATOMIC_SUB(ptr, val) __sync_fetch_and_add((ptr), -(val))
+
 /**
  * Atomically add val to *ptr
  * @return *ptr before the addition
  */
 #define UC_ATOMIC_ADD(ptr, val) __sync_fetch_and_add((ptr), (val))
 
-/**
- * Atomically subtract val from *ptr
- * @return *ptr before the subtraction
- */
-#define UC_ATOMIC_SUB(ptr, val) __sync_fetch_and_add((ptr), -(val))
 
 /**
  * Atomically decrement *ptr