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@@ -17,6 +17,7 @@ module Sass
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       end
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       def perform
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+        args = self.args.map {|a| a.perform}
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         unless Functions.public_instance_methods.include?(name) && name !~ /^__/
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           return Script::String.new("#{name}(#{args.join(', ')})")
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         end

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@@ -41,7 +41,6 @@ module Sass::Script
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     end
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     def percentage(value)
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-      value = value.perform if value.is_a?(Sass::Script::Operation)
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       unless value.is_a?(Sass::Script::Number) && value.unitless?
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         raise ArgumentError.new("Value is not a unitless number")
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       end