diff --git a/src/emqx_reason_codes.erl b/src/emqx_reason_codes.erl
index fdc1377ec..75118b563 100644
--- a/src/emqx_reason_codes.erl
+++ b/src/emqx_reason_codes.erl
@@ -139,4 +139,4 @@ compat(connack, 16#9D) -> ?CONNACK_SERVER;
 compat(connack, 16#9F) -> ?CONNACK_SERVER;
 
 compat(suback, Code) when Code =< ?QOS2 -> Code;
-compat(suback, Code) when Code > 16#80  -> 16#80.
+compat(suback, Code) when Code >= 16#80  -> 16#80.