diff --git a/mikeio/dfsu/_dfsu.py b/mikeio/dfsu/_dfsu.py
index d805a75c4..e89f56b78 100644
--- a/mikeio/dfsu/_dfsu.py
+++ b/mikeio/dfsu/_dfsu.py
@@ -361,7 +361,7 @@ def time(self) -> pd.DatetimeIndex:
             return pd.date_range(
                 start=self.start_time,
                 periods=self.n_timesteps,
-                freq=f"{self.timestep}s",
+                freq=f"{int(self.timestep)}s",
             )
         else:
             raise NotImplementedError(