diff --git a/gc.c b/gc.c
index 0056a8c438..9336a0dcf6 100644
--- a/gc.c
+++ b/gc.c
@@ -3408,6 +3408,7 @@ obj_memsize_of(VALUE obj, int use_all_types)
 	break;
       case T_RATIONAL:
       case T_COMPLEX:
+        break;
       case T_IMEMO:
 	if (imemo_type_p(obj, imemo_tmpbuf)) {
 	    size += RANY(obj)->as.imemo.alloc.cnt * sizeof(VALUE);