diff --git a/enhanced-file-server.go b/enhanced-file-server.go
index c086606..5fb6a71 100644
--- a/enhanced-file-server.go
+++ b/enhanced-file-server.go
@@ -715,7 +715,7 @@ type fileHandler struct {
 // As a special case, the returned file server redirects any request
 // ending in "/index.html" to the same path, without the final
 // "index.html".
-func FileServer(root FileSystem) http.Handler {
+func FileServer(root http.FileSystem) http.Handler {
 	return &fileHandler{root}
 }
 
diff --git a/example/main.go b/example/main.go
index 3e4594f..572d604 100644
--- a/example/main.go
+++ b/example/main.go
@@ -2,6 +2,7 @@ package main
 
 import (
 	"gitto.work/shortcut/enhancedfileserver"
+	"log"
 	"net/http"
 	"os"
 )