diff --git a/dll/win32/comctl32/combo.c b/dll/win32/comctl32/combo.c
index 62c2d4138a2..64ef0cff9db 100644
--- a/dll/win32/comctl32/combo.c
+++ b/dll/win32/comctl32/combo.c
@@ -1265,7 +1265,9 @@ static LRESULT COMBO_Command( LPHEADCOMBO lphc, WPARAM wParam, HWND hWnd )
                  * by arrow keys in the dropdown listbox */
                 if (!(lphc->wState & CBF_NOROLLUP))
                 {
+#ifndef __REACTOS__
                     CBRollUp( lphc, (HIWORD(wParam) == LBN_SELCHANGE), TRUE );
+#endif
                 }
                 else lphc->wState &= ~CBF_NOROLLUP;