diff --git a/reactos/dll/win32/user32/misc/display.c b/reactos/dll/win32/user32/misc/display.c
index cadf87685aa..22d070d5527 100644
--- a/reactos/dll/win32/user32/misc/display.c
+++ b/reactos/dll/win32/user32/misc/display.c
@@ -477,6 +477,9 @@ ChangeDisplaySettingsExA(
 
   rc = NtUserChangeDisplaySettings ( pDeviceName, pDevModeW, hwnd, dwflags, lParam );
 
+  if (pDevModeW != NULL)
+    RtlFreeHeap(GetProcessHeap(), pDevModeW);
+
   if (lpszDeviceName != NULL)
     RtlFreeUnicodeString ( &DeviceName );