diff --git a/win32ss/gdi/ntgdi/font.c b/win32ss/gdi/ntgdi/font.c
index 0c75a5a2dda..876fb02536c 100644
--- a/win32ss/gdi/ntgdi/font.c
+++ b/win32ss/gdi/ntgdi/font.c
@@ -927,6 +927,7 @@ NtGdiGetOutlineTextMetricsInternalW (HDC  hDC,
       EngSetLastError(ERROR_NOT_ENOUGH_MEMORY);
       return 0;
   }
+  RtlZeroMemory(potm, Size);
   IntGetOutlineTextMetrics(FontGDI, Size, potm);
 
   _SEH2_TRY