diff --git a/src/main/java/com/mysema/codegen/MemSourceFileObject.java b/src/main/java/com/mysema/codegen/MemSourceFileObject.java
index a1486f72a..08f5f9796 100644
--- a/src/main/java/com/mysema/codegen/MemSourceFileObject.java
+++ b/src/main/java/com/mysema/codegen/MemSourceFileObject.java
@@ -22,7 +22,7 @@ import javax.tools.SimpleJavaFileObject;
 public class MemSourceFileObject extends SimpleJavaFileObject {
     
     private static URI toUri(String fqname) {
-        return URI.create(fqname.replace(".","/") + ".java");
+        return URI.create("file:///" + fqname.replace(".","/") + ".java");
     }
     
     private final StringBuilder contents;