diff --git a/resources/rendertheme.xsd b/resources/rendertheme.xsd
index 728f0d83f..04e882194 100644
--- a/resources/rendertheme.xsd
+++ b/resources/rendertheme.xsd
@@ -68,8 +68,7 @@
 
     <xs:simpleType name="src">
         <xs:restriction base="xs:string">
-            <!-- <xs:pattern value="(jar|file)\:.+" /> -->
-            <xs:pattern value=".+" />
+            <xs:pattern value="(file|assets):.+" />
         </xs:restriction>
     </xs:simpleType>