diff --git a/spa/plugins/bluez5/backend-ofono.c b/spa/plugins/bluez5/backend-ofono.c
index 054632903..7208e3e3c 100644
--- a/spa/plugins/bluez5/backend-ofono.c
+++ b/spa/plugins/bluez5/backend-ofono.c
@@ -193,7 +193,7 @@ static int ofono_audio_acquire(void *data, bool optional)
 	uint8_t codec;
 	int ret = 0;
 
-	if (transport->fd)
+	if (transport->fd >= 0)
 		goto finish;
 
 	ret = _audio_acquire(backend, transport->path, &codec);