diff --git a/src/msw/window.cpp b/src/msw/window.cpp
index e00ac4b25f..a4e2e0c5f4 100644
--- a/src/msw/window.cpp
+++ b/src/msw/window.cpp
@@ -4830,7 +4830,7 @@ wxSize wxWindowMSW::GetDPI() const
 
     if ( !dpi.x || !dpi.y )
     {
-        WindowHDC hdc(GetHwnd());
+        WindowHDC hdc(hwnd);
         dpi.x = ::GetDeviceCaps(hdc, LOGPIXELSX);
         dpi.y = ::GetDeviceCaps(hdc, LOGPIXELSY);
     }