diff --git a/hamilflow/models/harmonic_oscillator_chain.py b/hamilflow/models/harmonic_oscillator_chain.py
index 1afe5f0..5adb8f6 100644
--- a/hamilflow/models/harmonic_oscillator_chain.py
+++ b/hamilflow/models/harmonic_oscillator_chain.py
@@ -78,7 +78,6 @@ def definition(
     ) -> dict[
         str,
         float
-        | int
         | dict[str, dict[str, float | list[float]]]
         | list[dict[str, dict[str, float | tuple[float, float]]]],
     ]: