diff --git a/cura/OAuth2/AuthorizationHelpers.py b/cura/OAuth2/AuthorizationHelpers.py
index a654ee4bdb..569ba80659 100644
--- a/cura/OAuth2/AuthorizationHelpers.py
+++ b/cura/OAuth2/AuthorizationHelpers.py
@@ -40,6 +40,7 @@ class AuthorizationHelpers:
         """
         data = {
             "client_id": self._settings.CLIENT_ID if self._settings.CLIENT_ID is not None else "",
+            "client_secret": self._settings.CLIENT_SECRET if self._settings.CLIENT_SECRET is not None else "",
             "redirect_uri": self._settings.CALLBACK_URL if self._settings.CALLBACK_URL is not None else "",
             "grant_type": "authorization_code",
             "code": authorization_code,
@@ -64,6 +65,7 @@ class AuthorizationHelpers:
         Logger.log("d", "Refreshing the access token for [%s]", self._settings.OAUTH_SERVER_URL)
         data = {
             "client_id": self._settings.CLIENT_ID if self._settings.CLIENT_ID is not None else "",
+            "client_secret": self._settings.CLIENT_SECRET if self._settings.CLIENT_SECRET is not None else "",
             "redirect_uri": self._settings.CALLBACK_URL if self._settings.CALLBACK_URL is not None else "",
             "grant_type": "refresh_token",
             "refresh_token": refresh_token,
diff --git a/cura/OAuth2/Models.py b/cura/OAuth2/Models.py
index 4c84872a09..3427f1cc3d 100644
--- a/cura/OAuth2/Models.py
+++ b/cura/OAuth2/Models.py
@@ -16,6 +16,7 @@ class OAuth2Settings(BaseModel):
     CALLBACK_PORT = None  # type: Optional[int]
     OAUTH_SERVER_URL = None  # type: Optional[str]
     CLIENT_ID = None  # type: Optional[str]
+    CLIENT_SECRET = None  # type: Optional[str]
     CLIENT_SCOPES = None  # type: Optional[str]
     CALLBACK_URL = None  # type: Optional[str]
     AUTH_DATA_PREFERENCE_KEY = ""  # type: str