diff --git a/components/style/properties/longhand/effects.mako.rs b/components/style/properties/longhand/effects.mako.rs
index 5ebf602262a..0a672851ab4 100644
--- a/components/style/properties/longhand/effects.mako.rs
+++ b/components/style/properties/longhand/effects.mako.rs
@@ -19,56 +19,14 @@ ${helpers.predefined_type("opacity",
                           extra_prefixes="webkit"
                           ignored_when_colors_disabled="True"
                           spec="https://drafts.csswg.org/css-backgrounds/#box-shadow">
-    use std::fmt;
-    use style_traits::ToCss;
-
     pub type SpecifiedValue = specified::Shadow;
 
-    impl ToCss for SpecifiedValue {
-        fn to_css<W>(&self, dest: &mut W) -> fmt::Result where W: fmt::Write {
-            if self.inset {
-                try!(dest.write_str("inset "));
-            }
-            try!(self.offset_x.to_css(dest));
-            try!(dest.write_str(" "));
-            try!(self.offset_y.to_css(dest));
-            try!(dest.write_str(" "));
-            try!(self.blur_radius.to_css(dest));
-            try!(dest.write_str(" "));
-            try!(self.spread_radius.to_css(dest));
-
-            if let Some(ref color) = self.color {
-                try!(dest.write_str(" "));
-                try!(color.to_css(dest));
-            }
-            Ok(())
-        }
-    }
-
     pub mod computed_value {
         use values::computed::Shadow;
 
         pub type T = Shadow;
     }
 
-    impl ToCss for computed_value::T {
-        fn to_css<W>(&self, dest: &mut W) -> fmt::Result where W: fmt::Write {
-            if self.inset {
-                try!(dest.write_str("inset "));
-            }
-            try!(self.blur_radius.to_css(dest));
-            try!(dest.write_str(" "));
-            try!(self.spread_radius.to_css(dest));
-            try!(dest.write_str(" "));
-            try!(self.offset_x.to_css(dest));
-            try!(dest.write_str(" "));
-            try!(self.offset_y.to_css(dest));
-            try!(dest.write_str(" "));
-            try!(self.color.to_css(dest));
-            Ok(())
-        }
-    }
-
     pub fn parse(context: &ParserContext, input: &mut Parser) -> Result<specified::Shadow, ()> {
         specified::Shadow::parse(context, input, false)
     }
diff --git a/components/style/values/computed/mod.rs b/components/style/values/computed/mod.rs
index acfc09f5c80..44a646171aa 100644
--- a/components/style/values/computed/mod.rs
+++ b/components/style/values/computed/mod.rs
@@ -483,6 +483,24 @@ pub struct Shadow {
     pub inset: bool,
 }
 
+impl ToCss for Shadow {
+    fn to_css<W>(&self, dest: &mut W) -> fmt::Result where W: fmt::Write {
+        if self.inset {
+            dest.write_str("inset ")?;
+        }
+        self.blur_radius.to_css(dest)?;
+        dest.write_str(" ")?;
+        self.spread_radius.to_css(dest)?;
+        dest.write_str(" ")?;
+        self.offset_x.to_css(dest)?;
+        dest.write_str(" ")?;
+        self.offset_y.to_css(dest)?;
+        dest.write_str(" ")?;
+        self.color.to_css(dest)?;
+        Ok(())
+    }
+}
+
 /// A `<number>` value.
 pub type Number = CSSFloat;
 
diff --git a/components/style/values/specified/mod.rs b/components/style/values/specified/mod.rs
index b198295064f..ca86d8d2664 100644
--- a/components/style/values/specified/mod.rs
+++ b/components/style/values/specified/mod.rs
@@ -878,6 +878,27 @@ impl ToComputedValue for Shadow {
     }
 }
 
+impl ToCss for Shadow {
+    fn to_css<W>(&self, dest: &mut W) -> fmt::Result where W: fmt::Write {
+        if self.inset {
+            dest.write_str("inset ")?;
+        }
+        self.offset_x.to_css(dest)?;
+        dest.write_str(" ")?;
+        self.offset_y.to_css(dest)?;
+        dest.write_str(" ")?;
+        self.blur_radius.to_css(dest)?;
+        dest.write_str(" ")?;
+        self.spread_radius.to_css(dest)?;
+
+        if let Some(ref color) = self.color {
+            dest.write_str(" ")?;
+            color.to_css(dest)?;
+        }
+        Ok(())
+    }
+}
+
 impl Shadow {
     // disable_spread_and_inset is for filter: drop-shadow(...)
     #[allow(missing_docs)]