diff --git a/conf.c b/conf.c
index fa725824..7a1cf4c3 100644
--- a/conf.c
+++ b/conf.c
@@ -352,11 +352,11 @@ static void kafka_conf_set_oauthbearer_token_refresh_cb(rd_kafka_t *rk, const ch
     zval args[2];
 
     if (!opaque) {
-        return 0;
+        return;
     }
 
     if (!cbs->oauthbearer_token_refresh) {
-        return 0;
+        return;
     }
 
     ZVAL_NULL(&args[0]);
@@ -369,8 +369,6 @@ static void kafka_conf_set_oauthbearer_token_refresh_cb(rd_kafka_t *rk, const ch
 
     zval_ptr_dtor(&args[0]);
     zval_ptr_dtor(&args[1]);
-
-    return 0;
 }