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-rw-r--r--src/stdio/ungetwc.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/stdio/ungetwc.c b/src/stdio/ungetwc.c
index f7cde2e0..6871d034 100644
--- a/src/stdio/ungetwc.c
+++ b/src/stdio/ungetwc.c
@@ -8,7 +8,7 @@ wint_t ungetwc(wint_t c, FILE *f)
 	if (c == WEOF) return c;
 
 	/* Try conversion early so we can fail without locking if invalid */
-	if (!isascii(c) && (l = wctomb(mbc, c)) < 0)
+	if (!isascii(c) && (l = wctomb((void *)mbc, c)) < 0)
 		return WEOF;
 
 	FLOCK(f);