--- a/gfx/public/nsFont.h
+++ b/gfx/public/nsFont.h
@@ -74,17 +74,17 @@ struct NS_GFX nsFont {
   // the name is the same as a CSS generic font family.
   unsigned int systemFont : 1;
 
   // The variant of the font (normal, small-caps)
   PRUint8 variant : 7;
 
   // True if the character set quirks (for treatment of "Symbol",
   // "Wingdings", etc.) should be applied.
-  PRPackedBool familyNameQuirks : 1;
+  PRUint8 familyNameQuirks : 1;
 
   // The weight of the font (0-999)
   PRUint16 weight;
 
   // The decorations on the font (underline, overline,
   // line-through). The decorations can be binary or'd together.
   PRUint8 decorations;