diff --git a/pycoupler/config.py b/pycoupler/config.py
index cec9530..e1cf2fe 100644
--- a/pycoupler/config.py
+++ b/pycoupler/config.py
@@ -589,7 +589,7 @@ def find_new_id():
                 # Duplicate id
                 id = find_new_id()
                 warnings.warn(
-                    f"Inputs contain duplicate ids. Violating input: '{key}' (id: '{inp["id"]}')"
+                    f"Inputs contain duplicate ids. Violating input: '{key}' (id: '{inp['id']}')"
                 )
                 setattr(getattr(self.input, key), "id", id)
             else: