diff --git a/src/NetCoreForce.Client/AuthenticationClient.cs b/src/NetCoreForce.Client/AuthenticationClient.cs
index 3f1a1da..636056b 100644
--- a/src/NetCoreForce.Client/AuthenticationClient.cs
+++ b/src/NetCoreForce.Client/AuthenticationClient.cs
@@ -301,7 +301,9 @@ public async Task TokenRefreshAsync(string refreshToken, string clientId, string
             if (responseMessage.IsSuccessStatusCode)
             {
                 this.AccessInfo = JsonConvert.DeserializeObject<AccessTokenResponse>(response);
-                this.AccessInfo.RefreshToken = refreshToken; //not included in reponse
+
+                //with refresh token rotation we get a new refresh token after exchanging the current one.
+                if (string.IsNullOrEmpty(this.AccessInfo.RefreshToken)) this.AccessInfo.RefreshToken = refreshToken; //when not included in response
             }
             else
             {
@@ -368,4 +370,4 @@ public void Dispose()
             _httpClient.Dispose();
         }
     }
-}
\ No newline at end of file
+}