diff --git a/quickcheck/aefate_code_eqc.erl b/quickcheck/aefate_code_eqc.erl
index e412dfd..c2b8f87 100644
--- a/quickcheck/aefate_code_eqc.erl
+++ b/quickcheck/aefate_code_eqc.erl
@@ -77,7 +77,7 @@ prop_opcodes() ->
 
 
 valid_opcodes() ->
-    lists:seq(0, 16#7f) ++ lists:seq(16#fa, 16#fd).
+    lists:seq(0, 16#7d) ++ lists:seq(16#fa, 16#fd).
 
 
 fate_code(Failure) ->