diff --git a/libs/filer/windows_root_path.go b/libs/filer/windows_root_path.go
index 70d91b746..c6dc4228e 100644
--- a/libs/filer/windows_root_path.go
+++ b/libs/filer/windows_root_path.go
@@ -28,7 +28,7 @@ func (p WindowsRootPath) Join(name string) (string, error) {
 
 	// Don't allow escaping the specified root using relative paths.
 	if !strings.HasPrefix(absPath, p.rootPath) {
-		return "", fmt.Errorf("relative path escapes root: %s", name)
+		return "", fmt.Errorf("relative path %s escapes root %s", name, p.rootPath)
 	}
 
 	return absPath, nil