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-rw-r--r--Python/codecs.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/Python/codecs.c b/Python/codecs.c
index 77eac8e..046abe3 100644
--- a/Python/codecs.c
+++ b/Python/codecs.c
@@ -70,7 +70,7 @@ PyObject *normalizestring(const char *string)
if (ch == ' ')
ch = '-';
else
- ch = tolower(ch);
+ ch = tolower(Py_CHARMASK(ch));
p[i] = ch;
}
return v;