diff --git a/handler.go b/handler.go
index 326061a..6c101ec 100644
--- a/handler.go
+++ b/handler.go
@@ -156,6 +156,10 @@ func generateDirectoryListing(path string) string {
 	}
 	listing = "# Directory listing\n\n"
 	for _, file := range files {
+		// Only list world readable files
+		if uint64(file.Mode().Perm())&0444 != 0444 {
+			continue
+		}
 		listing += fmt.Sprintf("=> %s %s\n", file.Name(), file.Name())
 	}
 	return listing