diff --git a/amm/runtime/src/main/scala/ammonite/runtime/Classpath.scala b/amm/runtime/src/main/scala/ammonite/runtime/Classpath.scala
index d6aa00a16..5ac752b71 100644
--- a/amm/runtime/src/main/scala/ammonite/runtime/Classpath.scala
+++ b/amm/runtime/src/main/scala/ammonite/runtime/Classpath.scala
@@ -43,7 +43,10 @@ object Classpath {
     while(current != null){
       current match{
         case t: java.net.URLClassLoader =>
-          files.appendAll(t.getURLs.map(u => new java.io.File(u.toURI)))
+          files.appendAll(
+            t.getURLs
+              .filter(u => "file".equals(u.getProtocol))
+              .map(u => new java.io.File(u.toURI)))
         case _ =>
       }
       current = current.getParent