diff --git a/src/Core/Abstractions/IUserService.cs b/src/Core/Abstractions/IUserService.cs
index b282acf54..076a612b2 100644
--- a/src/Core/Abstractions/IUserService.cs
+++ b/src/Core/Abstractions/IUserService.cs
@@ -20,7 +20,7 @@ namespace Bit.Core.Abstractions
         Task<string> GetUserIdAsync();
         Task<bool> IsAuthenticatedAsync();
         Task ReplaceOrganizationsAsync(Dictionary<string, OrganizationData> organizations);
-        Task SetInformationAsync(string userId, string email, KdfType kdf, int kdfIterations);
+        Task SetInformationAsync(string userId, string email, KdfType kdf, int? kdfIterations);
         Task SetSecurityStampAsync(string stamp);
     }
-}
\ No newline at end of file
+}
diff --git a/src/Core/Models/Response/IdentityTokenResponse.cs b/src/Core/Models/Response/IdentityTokenResponse.cs
index 6ccc9d6bc..27fe84fa7 100644
--- a/src/Core/Models/Response/IdentityTokenResponse.cs
+++ b/src/Core/Models/Response/IdentityTokenResponse.cs
@@ -19,6 +19,6 @@ namespace Bit.Core.Models.Response
         public string Key { get; set; }
         public string TwoFactorToken { get; set; }
         public KdfType Kdf { get; set; }
-        public int KdfIterations { get; set; }
+        public int? KdfIterations { get; set; }
     }
 }
diff --git a/src/Core/Services/UserService.cs b/src/Core/Services/UserService.cs
index f422528f3..d1e844f6f 100644
--- a/src/Core/Services/UserService.cs
+++ b/src/Core/Services/UserService.cs
@@ -32,7 +32,7 @@ namespace Bit.Core.Services
             _tokenService = tokenService;
         }
 
-        public async Task SetInformationAsync(string userId, string email, KdfType kdf, int kdfIterations)
+        public async Task SetInformationAsync(string userId, string email, KdfType kdf, int? kdfIterations)
         {
             _email = email;
             _userId = userId;