diff --git a/components/gfx/platform/freetype/font.rs b/components/gfx/platform/freetype/font.rs
index dfe649a0ca7..b121e869865 100644
--- a/components/gfx/platform/freetype/font.rs
+++ b/components/gfx/platform/freetype/font.rs
@@ -238,7 +238,7 @@ impl FontHandleMethods for FontHandle {
         let average_advance = self.glyph_index('0')
                                   .and_then(|idx| self.glyph_h_advance(idx))
                                   .map(|advance| self.font_units_to_au(advance))
-                                  .unwrap_or(max_advance_width);
+                                  .unwrap_or(max_advance);
 
         let metrics = FontMetrics {
             underline_size:   underline_size,