diff --git a/flatlaf-natives/flatlaf-natives-windows/src/main/cpp/HWNDMap.h b/flatlaf-natives/flatlaf-natives-windows/src/main/cpp/HWNDMap.h
index 8ace9a04..b9b5c6a8 100644
--- a/flatlaf-natives/flatlaf-natives-windows/src/main/cpp/HWNDMap.h
+++ b/flatlaf-natives/flatlaf-natives-windows/src/main/cpp/HWNDMap.h
@@ -48,7 +48,7 @@ public:
 
 private:
 	int binarySearch( HWND key );
-	void ensureCapacity( int newCapacity );
+	bool ensureCapacity( int newCapacity );
 
 //	void dump( char* msg );
 };