diff --git a/gfx/thebes/gfxMacPlatformFontList.mm b/gfx/thebes/gfxMacPlatformFontList.mm
index a07694207a3..ed07c27bf58 100644
--- a/gfx/thebes/gfxMacPlatformFontList.mm
+++ b/gfx/thebes/gfxMacPlatformFontList.mm
@@ -866,6 +866,7 @@ gfxMacPlatformFontList::LookupLocalFont(const gfxProxyFontEntry *aProxyEntry,
                                aProxyEntry->mItalic ?
                                    FONT_STYLE_ITALIC : FONT_STYLE_NORMAL,
                                nsnull);
+        newFontEntry->mIsUserFont = newFontEntry->mIsLocalUserFont = PR_TRUE;
     } else {
         newFontEntry =
             new MacOSFontEntry(aFontName, fontRef,