diff --git a/src/Control/SimpleResourceURLGenerator.php b/src/Control/SimpleResourceURLGenerator.php
index d30b8251d..5a825dbd6 100644
--- a/src/Control/SimpleResourceURLGenerator.php
+++ b/src/Control/SimpleResourceURLGenerator.php
@@ -71,6 +71,9 @@ class SimpleResourceURLGenerator implements ResourceURLGenerator
             $relativePath = $resource->getRelativePath();
             $exists = $resource->exists();
             $absolutePath = $resource->getPath();
+        } else if (Director::is_absolute_url($relativePath)) {
+            // Path is not relative, and probably not of this site
+            return $relativePath;
         } else {
             // Use normal string
             $absolutePath = preg_replace('/\?.*/', '', Director::baseFolder() . '/' . $relativePath);