diff --git a/reactos/dll/directx/ddraw/Ddraw/ddraw_displaymode.c b/reactos/dll/directx/ddraw/Ddraw/ddraw_displaymode.c
index c7247a6c888..289b8fa4bf4 100644
--- a/reactos/dll/directx/ddraw/Ddraw/ddraw_displaymode.c
+++ b/reactos/dll/directx/ddraw/Ddraw/ddraw_displaymode.c
@@ -24,6 +24,8 @@ Main_DirectDraw_EnumDisplayModes(LPDDRAWI_DIRECTDRAW_INT This, DWORD dwFlags,
 
     DX_WINDBG_trace();
 
+    ZeroMemory(&DevMode, sizeof(DEVMODE));
+
     _SEH_TRY
     {
 
@@ -45,6 +47,8 @@ Main_DirectDraw_EnumDisplayModes(LPDDRAWI_DIRECTDRAW_INT This, DWORD dwFlags,
             {
                 DDSURFACEDESC2 SurfaceDesc;
 
+                ZeroMemory(&SurfaceDesc, sizeof(DDSURFACEDESC2));
+
                 iMode++;
 
                 SurfaceDesc.dwSize = sizeof (DDSURFACEDESC2);