diff --git a/gfx/thebes/gfxMacPlatformFontList.mm b/gfx/thebes/gfxMacPlatformFontList.mm
index 0a8af0c79e3..598079212e3 100644
--- a/gfx/thebes/gfxMacPlatformFontList.mm
+++ b/gfx/thebes/gfxMacPlatformFontList.mm
@@ -1004,6 +1004,7 @@ gfxMacPlatformFontList::MakePlatformFontCG(const gfxProxyFontEntry *aProxyEntry,
                                      aProxyEntry->mItalic ?
                                          FONT_STYLE_ITALIC : FONT_STYLE_NORMAL,
                                      true, false));
+    ::CFRelease(fontRef);
 
     // if succeeded and font cmap is good, return the new font
     if (newFontEntry->mIsValid && NS_SUCCEEDED(newFontEntry->ReadCMAP())) {