diff --git a/patacrep/plastex.py b/patacrep/plastex.py
index b1c906b2..a17062ce 100644
--- a/patacrep/plastex.py
+++ b/patacrep/plastex.py
@@ -94,7 +94,10 @@ def parsetex(filename):
 
     # /* BEGIN plasTeX patch
     if oldlocale[0] and oldlocale[1]:
-        locale.setlocale(locale.LC_TIME, "%s.%s" % oldlocale)
+        try:
+            locale.setlocale(locale.LC_TIME, "%s.%s" % oldlocale)
+        except locale.Error:
+            pass  # Workaround a bug on windows
     # plasTeX patch END */
 
     # Extraction des données