diff --git a/drivers/s390/cio/device.c b/drivers/s390/cio/device.c
index 297659fa0e26..e44d92eac8e9 100644
--- a/drivers/s390/cio/device.c
+++ b/drivers/s390/cio/device.c
@@ -117,7 +117,10 @@ static int ccw_uevent(struct device *dev, char **envp, int num_envp,
 	snprint_alias(modalias_buf, sizeof(modalias_buf), id, "");
 	ret = add_uevent_var(envp, num_envp, &i, buffer, buffer_size, &len,
 			     "MODALIAS=%s", modalias_buf);
-	return ret;
+	if (ret)
+		return ret;
+	envp[i] = NULL;
+	return 0;
 }
 
 struct bus_type ccw_bus_type;