From 47f905b2cf1bce289381b854efb31f8ce5a25264 Mon Sep 17 00:00:00 2001
From: Marco Gorelli <33491632+MarcoGorelli@users.noreply.github.com>
Date: Thu, 25 Apr 2024 09:27:42 +0100
Subject: [PATCH] compat

---
 narwhals/_pandas_like/series.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/narwhals/_pandas_like/series.py b/narwhals/_pandas_like/series.py
index fa5b4050f..f02a86aea 100644
--- a/narwhals/_pandas_like/series.py
+++ b/narwhals/_pandas_like/series.py
@@ -373,7 +373,8 @@ def to_numpy(self) -> Any:
         has_missing = self._series.isna().any()
         if has_missing and str(self._series.dtype) in PANDAS_TO_NUMPY_DTYPE_MISSING:
             return self._series.to_numpy(
-                dtype=PANDAS_TO_NUMPY_DTYPE_MISSING[str(self._series.dtype)]
+                dtype=PANDAS_TO_NUMPY_DTYPE_MISSING[str(self._series.dtype)],
+                na_value=float("nan"),
             )
         if (
             not has_missing