diff --git a/src/SwaggerProvider.DesignTime/Provider.OpenApiClient.fs b/src/SwaggerProvider.DesignTime/Provider.OpenApiClient.fs
index 3fdb1fa2..9a23c179 100644
--- a/src/SwaggerProvider.DesignTime/Provider.OpenApiClient.fs
+++ b/src/SwaggerProvider.DesignTime/Provider.OpenApiClient.fs
@@ -52,9 +52,7 @@ type public OpenApiClientTypeProvider(cfg : TypeProviderConfig) as this =
                     |> sprintf "%A"
 
 
-                match Cache.providedTypes.TryRetrieve(cacheKey) with
-                | Some(ty) -> ty
-                | None ->
+                let addCache() =
                     let schemaData =
                         match schemaPathRaw.StartsWith("http", true, null) with
                         | true  ->
@@ -88,8 +86,8 @@ type public OpenApiClientTypeProvider(cfg : TypeProviderConfig) as this =
                     ty.AddMembers tys
                     tempAsm.AddTypes [ty]
 
-                    Cache.providedTypes.Set(cacheKey, ty)
                     ty
+                Cache.providedTypes.GetOrAdd(cacheKey, addCache)
         )
         t
     do