diff --git a/src/main/org/apache/tools/ant/taskdefs/Definer.java b/src/main/org/apache/tools/ant/taskdefs/Definer.java
index a4ab2c880..14642a037 100644
--- a/src/main/org/apache/tools/ant/taskdefs/Definer.java
+++ b/src/main/org/apache/tools/ant/taskdefs/Definer.java
@@ -342,7 +342,7 @@ public abstract class Definer extends DefBase {
         }
         try {
             if (message == null) {
-                return file.toURL();
+                return FileUtils.getFileUtils().getFileURL(file);
             }
         } catch (Exception ex) {
             message =