diff --git a/arrange.go b/arrange.go
index 4d4059f..aee3f8d 100644
--- a/arrange.go
+++ b/arrange.go
@@ -53,6 +53,9 @@ func Source(root string) <-chan string {
 		err := filepath.Walk(
 			root,
 			func(path string, info os.FileInfo, err error) error {
+				if err != nil {
+					return err
+				}
 				if info.IsDir() {
 					return nil
 				}