diff --git a/lib/compass/sass_extensions/functions/inline_image.rb b/lib/compass/sass_extensions/functions/inline_image.rb
index c0e732f1..fd7ca87f 100644
--- a/lib/compass/sass_extensions/functions/inline_image.rb
+++ b/lib/compass/sass_extensions/functions/inline_image.rb
@@ -42,7 +42,7 @@ private
     when /\.ttf$/i
       'font/truetype'
     when /\.woff$/i
-      'font/woff'
+      'application/x-font-woff'
     when /\.off$/i
       'font/openfont'
     when /\.([a-zA-Z]+)$/