diff --git a/admin.go b/admin.go
index 56beaa6..f19ef17 100644
--- a/admin.go
+++ b/admin.go
@@ -142,6 +142,7 @@ func newHandler(coll *mgo.Collection) func(http.ResponseWriter, *http.Request) {
 
 func ValidFileName(path string, title string, extension string) string {
 	title = strings.Replace(title, "/", "_", -1)
+	title = strings.Replace(title, "?", "_", -1)
 	file := path + "/" + title + extension
 	_, err := os.Stat(file)
 	for i := 0; err == nil; i++ {