diff --git a/headers/os/interface/MenuBar.h b/headers/os/interface/MenuBar.h
index 8c0be34ea0..26e904ec01 100644
--- a/headers/os/interface/MenuBar.h
+++ b/headers/os/interface/MenuBar.h
@@ -81,7 +81,9 @@ public:
 
 
 			// layout related
+	virtual	BSize			MinSize();
 	virtual	BSize			MaxSize();
+	virtual	BSize			PreferredSize();
 
 /*----- Private or reserved -----------------------------------------*/
 	virtual status_t		Perform(perform_code d, void *arg);
diff --git a/src/kits/interface/MenuBar.cpp b/src/kits/interface/MenuBar.cpp
index 4b48a2ddf2..bdb4344cae 100644
--- a/src/kits/interface/MenuBar.cpp
+++ b/src/kits/interface/MenuBar.cpp
@@ -327,15 +327,26 @@ BMenuBar::Perform(perform_code d, void *arg)
 }
 
 
+BSize
+BMenuBar::MinSize()
+{
+	return BMenu::MinSize();
+}
+
+
 BSize
 BMenuBar::MaxSize()
 {
-	// TODO: cache the result
-	float width, height;
-	GetPreferredSize(&width, &height);
-
+	BSize size = BMenu::MaxSize();
 	return BLayoutUtils::ComposeSize(ExplicitMaxSize(),
-		BSize(B_SIZE_UNLIMITED, height));
+		BSize(B_SIZE_UNLIMITED, size.height));
+}
+
+
+BSize
+BMenuBar::PreferredSize()
+{
+	return BMenu::PreferredSize();
 }