@@ -24,11 +24,11 @@
 of_atomic_int32_add(volatile int32_t *_Nonnull p, int32_t i)
 {
 	return (*p += i);
 }
 
-static OF_INLINE void*
+static OF_INLINE void *_Nullable
 of_atomic_ptr_add(void *volatile _Nullable *_Nonnull p, intptr_t i)
 {
 	return (*(char* volatile*)p += i);
 }
 
@@ -42,11 +42,11 @@
 of_atomic_int32_sub(volatile int32_t *_Nonnull p, int32_t i)
 {
 	return (*p -= i);
 }
 
-static OF_INLINE void*
+static OF_INLINE void *_Nullable
 of_atomic_ptr_sub(void *volatile _Nullable *_Nonnull p, intptr_t i)
 {
 	return (*(char* volatile*)p -= i);
 }