diff --git a/pipewire-jack/src/pipewire-jack.c b/pipewire-jack/src/pipewire-jack.c
index c7017e936..55f2d0d56 100644
--- a/pipewire-jack/src/pipewire-jack.c
+++ b/pipewire-jack/src/pipewire-jack.c
@@ -2210,7 +2210,7 @@ on_rtsocket_condition(void *data, int fd, uint32_t mask)
 		}
 	} else if (SPA_LIKELY(mask & SPA_IO_IN)) {
 		uint32_t buffer_frames;
-		int status = 0;
+		int status = -EBUSY;
 
 		buffer_frames = cycle_run(c);
 
@@ -4875,7 +4875,7 @@ int jack_activate (jack_client_t *client)
 	freeze_callbacks(c);
 
 	/* reemit buffer_frames */
-	c->buffer_frames = 0;
+	c->buffer_frames = (uint32_t)-1;
 
 	pw_data_loop_start(c->loop);
 	c->active = true;
@@ -5456,7 +5456,7 @@ SPA_EXPORT
 jack_nframes_t jack_get_buffer_size (jack_client_t *client)
 {
 	struct client *c = (struct client *) client;
-	jack_nframes_t res = -1;
+	uint32_t res = -1;
 
 	return_val_if_fail(c != NULL, 0);
 
@@ -5473,7 +5473,7 @@ jack_nframes_t jack_get_buffer_size (jack_client_t *client)
 	}
 	c->buffer_frames = res;
 	pw_log_debug("buffer_frames: %u", res);
-	return res;
+	return (jack_nframes_t)res;
 }
 
 SPA_EXPORT