diff --git a/grails-app/taglib/org/grails/plugin/resource/ResourceTagLib.groovy b/grails-app/taglib/org/grails/plugin/resource/ResourceTagLib.groovy
index ae83ec9..86120a7 100644
--- a/grails-app/taglib/org/grails/plugin/resource/ResourceTagLib.groovy
+++ b/grails-app/taglib/org/grails/plugin/resource/ResourceTagLib.groovy
@@ -549,7 +549,7 @@ class ResourceTagLib {
         def ctxPath = request.contextPath
 
         def uri = attrs.remove('uri')
-        def abs = uri?.indexOf('://') >= 0
+        def abs = uri?.indexOf('://') >= 0 || uri?.startsWith('//') // allow for scheme-less urls
 
         if (!uri) {
             // use the link generator to avoid stack overflow calling back into us