diff --git a/lib/compass/sass_extensions/functions/if.rb b/lib/compass/sass_extensions/functions/if.rb
index 98c1591d..9f599de4 100644
--- a/lib/compass/sass_extensions/functions/if.rb
+++ b/lib/compass/sass_extensions/functions/if.rb
@@ -1,9 +1,9 @@
 module Compass::SassExtensions::Functions::If
-  def if(truth, if_true, if_false)
+  def if(truth, if_true, if_false = nil)
     if truth.to_bool
       if_true
     else
-      if_false
+      if_false || Sass::Script::Bool.new(false)
     end
   end
 end