diff --git a/desmume/src/windows/main.cpp b/desmume/src/windows/main.cpp
index 954905094..358c243e8 100644
--- a/desmume/src/windows/main.cpp
+++ b/desmume/src/windows/main.cpp
@@ -1659,6 +1659,9 @@ void UpdateWndRects(HWND hwnd)
 		MainScreenRect.right = ptClient.x;
 		MainScreenRect.bottom = ptClient.y;
 
+		//if there was no specified screen gap, extend the top screen to cover the extra column
+		if(ScreenGap == 0) MainScreenRect.right += gapHeight;
+
 		// Sub screen
 		ptClient.x = (rc.left + oneScreenHeight + gapHeight);
 		ptClient.y = rc.top;
@@ -1691,6 +1694,9 @@ void UpdateWndRects(HWND hwnd)
 		MainScreenRect.right = ptClient.x;
 		MainScreenRect.bottom = ptClient.y;
 
+		//if there was no specified screen gap, extend the top screen to cover the extra row
+		if(ScreenGap == 0) MainScreenRect.bottom += gapHeight;
+
 		// Sub screen
 		ptClient.x = rc.left;
 		ptClient.y = (rc.top + oneScreenHeight + gapHeight);