--- a/src/hotspot/cpu/s390/s390.ad	Mon Jul 09 09:38:11 2018 +0100
+++ b/src/hotspot/cpu/s390/s390.ad	Mon Jul 09 15:26:58 2018 +0200
@@ -9839,7 +9839,7 @@
   match(Set index (PartialSubtypeCheck sub super));
   effect(KILL pcc, KILL scratch1, KILL scratch2);
   ins_cost(10 * DEFAULT_COST);
-  size(12);
+  // TODO: s390 port size(FIXED_SIZE);
   format %{ "  CALL   PartialSubtypeCheck\n" %}
   ins_encode %{
     AddressLiteral stub_address(StubRoutines::zarch::partial_subtype_check());