1 files changed, 1 insertions, 1 deletions
diff --git a/halibut.h b/halibut.h
index f3de665..3205e46 100644
--- a/halibut.h
+++ b/halibut.h
@@ -289,7 +289,7 @@ int utoi(wchar_t *);
 int utob(wchar_t *);
 int uisdigit(wchar_t);
 wchar_t *ustrlow(wchar_t *s);
-wchar_t *ustrftime(wchar_t *fmt, struct tm *timespec);
+wchar_t *ustrftime(const wchar_t *wfmt, const struct tm *timespec);
 int cvt_ok(int charset, const wchar_t *s);
 
 /*