diff --git a/src/kits/interface/BMCPrivate.cpp b/src/kits/interface/BMCPrivate.cpp
index 499b7a6f0d..10ef677bcb 100644
--- a/src/kits/interface/BMCPrivate.cpp
+++ b/src/kits/interface/BMCPrivate.cpp
@@ -208,18 +208,27 @@ void _BMCMenuBar_::FrameResized(float width, float height)
 	BMenuField* menuField = dynamic_cast<BMenuField*>(Parent());
 	if (menuField) {
 		float diff = Frame().right - menuField->Bounds().right;
-		if (diff > 0 && Window()) {
-			// clean up the dirty right top corner of
-			// the menu field when enlarging
-			BRect dirty(menuField->Bounds());
-			dirty.left = dirty.right - 2;
-			dirty.bottom = Frame().top - 1;
-			menuField->Invalidate(dirty);
+		if (Window()) {
+			if (diff > 0) {
+				// clean up the dirty right top corner of
+				// the menu field when enlarging
+				BRect dirty(menuField->Bounds());
+				dirty.left = dirty.right - 2;
+				dirty.bottom = Frame().top - 1;
+				menuField->Invalidate(dirty);
+			} else if (diff < 0) {
+				// clean up the dirty right line of
+				// the menu field when shrinking
+				BRect dirty(menuField->Bounds());
+				dirty.left = dirty.right + diff + 1;
+				dirty.right = dirty.left + 1;
+				menuField->Invalidate(dirty);
+			}
 		}
 		// we have been shrinked or enlarged and need to take
 		// of the size of the parent menu field as well
 		// NOTE: no worries about follow mode, we follow left and top
-		menuField->ResizeBy(diff + 1, 0.0);
+		menuField->ResizeBy(diff + 2, 0.0);
 	}
 	BMenuBar::FrameResized(width, height);
 }