diff --git a/modules/common/src/main/scala/docspell/common/Ident.scala b/modules/common/src/main/scala/docspell/common/Ident.scala
index 199bd225..e17d54f0 100644
--- a/modules/common/src/main/scala/docspell/common/Ident.scala
+++ b/modules/common/src/main/scala/docspell/common/Ident.scala
@@ -15,7 +15,7 @@ object Ident {
   implicit val identEq: Eq[Ident] =
     Eq.by(_.id)
 
-  val chars: Set[Char] = (('A' to 'Z') ++ ('a' to 'z') ++ ('0' to '9') ++ "-_").toSet
+  val chars: Set[Char] = (('A' to 'Z') ++ ('a' to 'z') ++ ('0' to '9') ++ "-_.").toSet
 
   def randomUUID[F[_]: Sync]: F[Ident] =
     Sync[F].delay(unsafe(UUID.randomUUID.toString))