diff --git a/gc.c b/gc.c
index 41bf553eb5..859e8d6ac7 100644
--- a/gc.c
+++ b/gc.c
@@ -2277,7 +2277,7 @@ ready_to_gc(rb_objspace_t *objspace)
 }
 
 #if defined(__GNUC__) && __GNUC__ == 4 && __GNUC_MINOR__ == 4
-__attribute__((optimize("O0"))) 
+__attribute__((optimize("O0")))
 #endif
 static void
 before_gc_sweep(rb_objspace_t *objspace)