diff --git a/src/Server/Authentication.fs b/src/Server/Authentication.fs
index 5e1c145..16c627d 100644
--- a/src/Server/Authentication.fs
+++ b/src/Server/Authentication.fs
@@ -59,21 +59,18 @@ let claimsToAuthUser (cp:ClaimsPrincipal):AuthenticatedUser =
     cp.Claims
     |> Seq.fold (fun state c -> match c.Type with
                                 | JwtRegisteredClaimNames.Sub -> { state with Email = c.Value}
-                                | ClaimTypes.Sid -> { state with Id = UserId (Guid.Parse(c.Value))}
+                                | ClaimTypes.Sid -> { state with Id = Guid.Parse(c.Value)}
                                 | ClaimTypes.Role -> { state with Roles = (state.Roles @ [c.Value])}
                                 | _ -> state)
-        { Id = UserId(Guid.Empty)
+        { Id = Guid.Empty
           Email = ""
           Roles = [] }
 
 let generateToken secret issuer (user:User) =
-    let guid (UserId id) =
-        id
-
     let claims = [|
         Claim(JwtRegisteredClaimNames.Sub, user.Email)
         Claim(JwtRegisteredClaimNames.Jti, Guid.NewGuid().ToString())
-        Claim(ClaimTypes.Sid, (guid user.Id).ToString())
+        Claim(ClaimTypes.Sid, (user.Id).ToString())
         Claim(ClaimTypes.Role, "Admin") |] //TODO: Not everone is admin; use literal
 
     let roles = user.Roles |> List.map (fun r -> Claim(ClaimTypes.Role, r))
diff --git a/src/Server/Events.fs b/src/Server/Events.fs
index 087ebd2..1fc3047 100644
--- a/src/Server/Events.fs
+++ b/src/Server/Events.fs
@@ -74,7 +74,7 @@ and PasswordChanged = {
     Id: UserId
     Password: string
 }
-and UserId = | UserId of System.Guid
+and UserId = System.Guid
 
 
 type Error =
diff --git a/src/Server/Smapi.fs b/src/Server/Smapi.fs
index 8f46f86..5b67ed1 100644
--- a/src/Server/Smapi.fs
+++ b/src/Server/Smapi.fs
@@ -184,7 +184,7 @@ module Smapi =
         | true -> None
         | false -> Some (List.reduce (fun _ i -> i) filteredLs)
 
-    let processGetMediaURI eventstore s (UserId u) =
+    let processGetMediaURI eventstore s userId =
         let req = GetMediaURIRequest.Parse s
         let id = req.Body.GetMediaUri.Id
         let episode = match id with
@@ -203,7 +203,7 @@ module Smapi =
             | Some (PlayEpisodeStopped data) -> if data.Id = episodeId then Some (data.Position) else None
             | _ -> None
 
-        let (events, _) = getAllEventsFromStreamById eventstore (getPlayEpisodeStreamId u episode.FeedId episode.Id)
+        let (events, _) = getAllEventsFromStreamById eventstore (getPlayEpisodeStreamId userId episode.FeedId episode.Id)
         let position = match lastPlayEpisodeStopped events with
                        | IsNeededPlaySecondsReported episode.Id position -> Some position
                        | IsNeededPlayEpisodeStopped episode.Id position -> Some position
@@ -219,7 +219,7 @@ module Smapi =
                        PollIntervall = 500 }
         ok (toLastUpdateXml result)
 
-    let processReportPlaySecondsRequest eventstore s (UserId u) =
+    let processReportPlaySecondsRequest eventstore s u =
         let req = ReportPlaySecondsRequest.Parse s
         let id = req.Body.ReportPlaySeconds.Id
         let position = req.Body.ReportPlaySeconds.OffsetMillis
diff --git a/src/Server/UserCompositions.fs b/src/Server/UserCompositions.fs
index 5bc98f5..8fe90e4 100644
--- a/src/Server/UserCompositions.fs
+++ b/src/Server/UserCompositions.fs
@@ -33,7 +33,7 @@ let getUserComposition eventStore email =
 let addUserComposition eventStore (rendition:AddUserRendition) =
     let salt = generateSalt()
     let hash = calculateHash rendition.Password salt
-    UserAdded { Id = Guid.NewGuid() |> UserId
+    UserAdded { Id = Guid.NewGuid()
                 Email = rendition.EMail
                 PasswordHash = hash
                 Salt = salt }