diff --git a/middleman-core/features/asset_host.feature b/middleman-core/features/asset_host.feature
index bcd4c06c..47ef143e 100644
--- a/middleman-core/features/asset_host.feature
+++ b/middleman-core/features/asset_host.feature
@@ -11,6 +11,7 @@ Feature: Alternate between multiple asset hosts
     Then I should see 'src="https://code.jquery.com/jquery-2.1.3.min.js"'
     Then I should see content matching %r{http://assets1.example.com/}
     Then I should not see content matching %r{http://assets1.example.com//}
+    Then I should see content matching %r{'//www.example.com/script.js'}
     When I go to "/stylesheets/asset_host.css"
     Then I should see content matching %r{http://assets1.example.com/}
     Then I should not see content matching %r{http://assets1.example.com//}
@@ -28,6 +29,7 @@ Feature: Alternate between multiple asset hosts
     Then I should see 'src="https://code.jquery.com/jquery-2.1.3.min.js"'
     Then I should see content matching %r{http://assets1.example.com/}
     Then I should not see content matching %r{http://assets1.example.com//}
+    Then I should see content matching %r{'//www.example.com/script.js'}
     When I go to "/stylesheets/asset_host.css"
     Then I should see content matching %r{http://assets1.example.com/}
-    Then I should not see content matching %r{http://assets1.example.com//}
\ No newline at end of file
+    Then I should not see content matching %r{http://assets1.example.com//}
diff --git a/middleman-core/fixtures/asset-host-app/source/asset_host.html.erb b/middleman-core/fixtures/asset-host-app/source/asset_host.html.erb
index 41490760..a528d275 100755
--- a/middleman-core/fixtures/asset-host-app/source/asset_host.html.erb
+++ b/middleman-core/fixtures/asset-host-app/source/asset_host.html.erb
@@ -39,4 +39,6 @@
 <%= image_tag "blank1031.gif" %>
 <%= image_tag "blank1032.gif" %>
 <%= image_tag "blank1033.gif" %>
-<%= image_tag "blank1034.gif" %>
\ No newline at end of file
+<%= image_tag "blank1034.gif" %>
+
+<script>(function(a,b,c,d){})(window,document,'script','//www.example.com/script.js');</script>
diff --git a/middleman-core/lib/middleman-core/util.rb b/middleman-core/lib/middleman-core/util.rb
index b27633e3..b06593f0 100644
--- a/middleman-core/lib/middleman-core/util.rb
+++ b/middleman-core/lib/middleman-core/util.rb
@@ -333,7 +333,7 @@ module Middleman
         asset_path = $2
 
         uri = ::Addressable::URI.parse(asset_path)
-        if uri.relative? && result = yield(asset_path)
+        if uri.relative? && uri.host.nil? && (result = yield(asset_path))
           "#{opening_character}#{result}"
         else
           match