diff --git a/plotnine/coords/coord.py b/plotnine/coords/coord.py
index b8a7918ec..28888cc73 100644
--- a/plotnine/coords/coord.py
+++ b/plotnine/coords/coord.py
@@ -221,7 +221,7 @@ def munch_data(data: pd.DataFrame, dist: FloatArray) -> pd.DataFrame:
     # not counting the last one
     dist[np.isnan(dist)] = 1
     extra = np.maximum(np.floor(dist / segment_length), 1)
-    extra = extra.astype(int, copy=False)
+    extra = extra.astype(int)
 
     # Generate extra pieces for x and y values
     # The final point must be manually inserted at the end
diff --git a/plotnine/facets/facet.py b/plotnine/facets/facet.py
index b267a1214..6b858426c 100644
--- a/plotnine/facets/facet.py
+++ b/plotnine/facets/facet.py
@@ -522,7 +522,7 @@ def _unique(s: pd.Series[Any]) -> npt.NDArray[Any] | pd.Index:
     # preserve the column dtypes
     for col in df:
         t = df[col].dtype
-        _df[col] = _df[col].astype(t, copy=False)
+        _df[col] = _df[col].astype(t)
     return _df