diff --git a/spa/plugins/alsa/alsa-seq-bridge.c b/spa/plugins/alsa/alsa-seq-bridge.c
index 63945e003..7c887c573 100644
--- a/spa/plugins/alsa/alsa-seq-bridge.c
+++ b/spa/plugins/alsa/alsa-seq-bridge.c
@@ -857,7 +857,7 @@ static int impl_node_port_reuse_buffer(void *object, uint32_t port_id, uint32_t
 
 	spa_return_val_if_fail(this != NULL, -EINVAL);
 
-	spa_return_val_if_fail(!CHECK_PORT(this, SPA_DIRECTION_OUTPUT, port_id), -EINVAL);
+	spa_return_val_if_fail(CHECK_PORT(this, SPA_DIRECTION_OUTPUT, port_id), -EINVAL);
 
 	port = GET_PORT(this, SPA_DIRECTION_OUTPUT, port_id);