diff --git a/docs/src/conf.py b/docs/src/conf.py
index 77df2902..0df6b36a 100644
--- a/docs/src/conf.py
+++ b/docs/src/conf.py
@@ -6,6 +6,7 @@
 
 from datetime import datetime
 import os
+import locale
 from pathlib import Path
 import re
 import sys
@@ -26,7 +27,7 @@
     os.environ["ESMFMKFILE"] = f"{rtd_conda_prefix}/lib/esmf.mk"
     os.environ["PROJ_DATA"] = f"{rtd_conda_prefix}/share/proj"
     os.environ["PROJ_NETWORK"] = "OFF"
-    os.environ["LC_ALL"] = "C"
+    locale.setlocale(locale.LC_NUMERIC, "C")
 
 
 # -- Project information -----------------------------------------------------