2 files changed, 5 insertions, 3 deletions
diff --git a/ChangeLog b/ChangeLog
index 26050a650e..9ccb53ae0a 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Fri Oct 30 06:20:40 2015  Koichi Sasada  <ko1@atdot.net>
+
+	* insns.def: nobody set ic->ic_value.value to Qundef.
+
 Fri Oct 30 06:15:50 2015  Koichi Sasada  <ko1@atdot.net>
 
 	* vm.c: add ifndef guard for VM_CHECK_MODE.
diff --git a/insns.def b/insns.def
index cbe36debcc..6b3f6dcf7e 100644
--- a/insns.def
+++ b/insns.def
@@ -1185,9 +1185,7 @@ setinlinecache
 (VALUE val)
 (VALUE val)
 {
-    if (ic->ic_value.value == Qundef) {
-	rb_iseq_add_mark_object(GET_ISEQ(), val);
-    }
+    VM_ASSERT(ic->ic_value.value != Qundef);
     ic->ic_value.value = val;
     ic->ic_serial = GET_GLOBAL_CONSTANT_STATE() - ruby_vm_const_missing_count;
     ic->ic_cref = rb_vm_get_cref(GET_EP());