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-rw-r--r--src/wctype/towlower.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/wctype/towlower.c b/src/wctype/towlower.c
index 30258662..b162afa7 100644
--- a/src/wctype/towlower.c
+++ b/src/wctype/towlower.c
@@ -17,6 +17,8 @@ wint_t towlower(wint_t wc)
return towctrans(wc, trans);
}
+__check_1(wint_t, 0, towlower, wint_t)
+
/***
The fn(towlower) function converts a wide uppercase letter to its equivalent
lowercase letter in the current locale.