diff --git a/apps/emqx_auth_http/src/emqx_acl_http.erl b/apps/emqx_auth_http/src/emqx_acl_http.erl
index 23588fe9a..a6f60b465 100644
--- a/apps/emqx_auth_http/src/emqx_acl_http.erl
+++ b/apps/emqx_auth_http/src/emqx_acl_http.erl
@@ -36,7 +36,6 @@
 
 -spec(register_metrics() -> ok).
 register_metrics() ->
-    io:format("testing"),
     lists:foreach(fun emqx_metrics:ensure/1, ?ACL_METRICS).
 
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