diff --git a/src/gc.c b/src/gc.c
index 0f2c3bfab..58fdf9434 100644
--- a/src/gc.c
+++ b/src/gc.c
@@ -782,7 +782,6 @@ obj_free(mrb_state *mrb, struct RBasic *obj, int end)
   switch (obj->tt) {
     /* immediate - no mark */
   case MRB_TT_TRUE:
-  case MRB_TT_INTEGER:
   case MRB_TT_SYMBOL:
     /* cannot happen */
     return;