diff --git a/src/osdep/amiberry_gfx.cpp b/src/osdep/amiberry_gfx.cpp
index 4d19b4ad..f26f317b 100644
--- a/src/osdep/amiberry_gfx.cpp
+++ b/src/osdep/amiberry_gfx.cpp
@@ -1879,6 +1879,7 @@ int vsync_isdone(frame_time_t* dt)
 {
 	if (isvsync() == 0)
 		return -1;
+	return 0;
 }
 
 bool target_graphics_buffer_update()