diff --git a/src/gb/renderers/software.c b/src/gb/renderers/software.c
index 8ec3444e3..5b901d235 100644
--- a/src/gb/renderers/software.c
+++ b/src/gb/renderers/software.c
@@ -90,7 +90,7 @@ static void GBVideoSoftwareRendererUpdateWindow(struct GBVideoSoftwareRenderer*
 			renderer->hasWindow = true;
 		} else {
 			if (!renderer->hasWindow) {
-				renderer->currentWy = renderer->lastY + 1 - renderer->wy;
+				renderer->currentWy = renderer->lastY - renderer->wy;
 			} else {
 				renderer->currentWy += renderer->lastY;
 			}