diff --git a/apps/emqx_authn/src/emqx_authn_app.erl b/apps/emqx_authn/src/emqx_authn_app.erl
index 016decdd2..4d4a22791 100644
--- a/apps/emqx_authn/src/emqx_authn_app.erl
+++ b/apps/emqx_authn/src/emqx_authn_app.erl
@@ -60,7 +60,7 @@ initialize() ->
 providers() ->
     [ {{'password-based', 'built-in-database'}, emqx_authn_mnesia}
     , {{'password-based', mysql}, emqx_authn_mysql}
-    , {{'password-based', posgresql}, emqx_authn_pgsql}
+    , {{'password-based', postgresql}, emqx_authn_pgsql}
     , {{'password-based', mongodb}, emqx_authn_mongodb}
     , {{'password-based', redis}, emqx_authn_redis}
     , {{'password-based', 'http-server'}, emqx_authn_http}