diff --git a/gfx/src/nsFont.h b/gfx/src/nsFont.h
index c349390ebd81..7e942f574903 100644
--- a/gfx/src/nsFont.h
+++ b/gfx/src/nsFont.h
@@ -86,6 +86,7 @@ struct NS_GFX nsFont {
 #define NS_FONT_VARIANT_NORMAL            0
 #define NS_FONT_VARIANT_SMALL_CAPS        1
 
+#define NS_FONT_DECORATION_NONE           0x0
 #define NS_FONT_DECORATION_UNDERLINE      0x1
 #define NS_FONT_DECORATION_OVERLINE       0x2
 #define NS_FONT_DECORATION_LINE_THROUGH   0x4