diff --git a/passageidentity/user.py b/passageidentity/user.py
index 95257a3..4fa9a98 100644
--- a/passageidentity/user.py
+++ b/passageidentity/user.py
@@ -69,7 +69,7 @@ def get_by_identifier(self, identifier: str) -> PassageUser:
             raise PassageError.from_response_error(e, msg) from e
 
         if len(users) == 0:
-            msg = "Could not find user with identifier: {identifier}"
+            msg = "User not found."
             raise PassageError(msg)
 
         return self.get(users[0].id)
diff --git a/tests/user_test.py b/tests/user_test.py
index 6dfc059..2abbdb2 100644
--- a/tests/user_test.py
+++ b/tests/user_test.py
@@ -39,7 +39,7 @@ def test_get_by_identifier_valid_upper_case() -> None:
 def test_get_by_identifier_user_not_exist() -> None:
     psg = Passage(PASSAGE_APP_ID, PASSAGE_API_KEY)
 
-    with pytest.raises(PassageError, match="Could not find user with identifier"):
+    with pytest.raises(PassageError, match="User not found."):
         psg.user.get_by_identifier("error@passage.id")