diff --git a/apps/emqx_connector/src/emqx_connector_jwt.erl b/apps/emqx_connector/src/emqx_connector_jwt.erl
index dd74754ba..60b35ddbb 100644
--- a/apps/emqx_connector/src/emqx_connector_jwt.erl
+++ b/apps/emqx_connector/src/emqx_connector_jwt.erl
@@ -141,5 +141,5 @@ store_jwt(#{resource_id := ResourceId, table := TId}, JWT) ->
 is_about_to_expire(JWT) ->
     #jose_jwt{fields = #{<<"exp">> := Exp}} = jose_jwt:peek(JWT),
     Now = erlang:system_time(seconds),
-    GraceExp = Exp - timer:seconds(5),
+    GraceExp = Exp - 5,
     Now >= GraceExp.
diff --git a/apps/emqx_connector/test/emqx_connector_jwt_SUITE.erl b/apps/emqx_connector/test/emqx_connector_jwt_SUITE.erl
index 6469614f8..aef0e660c 100644
--- a/apps/emqx_connector/test/emqx_connector_jwt_SUITE.erl
+++ b/apps/emqx_connector/test/emqx_connector_jwt_SUITE.erl
@@ -125,7 +125,7 @@ t_ensure_jwt(_Config) ->
             JWT0 = emqx_connector_jwt:ensure_jwt(JWTConfig),
             ?assertNot(is_expired(JWT0)),
             %% should refresh 5 s before expiration
-            ct:sleep(Expiration - 5500),
+            ct:sleep(Expiration - 3000),
             JWT1 = emqx_connector_jwt:ensure_jwt(JWTConfig),
             ?assertNot(is_expired(JWT1)),
             %% fully expired