diff --git a/run.c b/run.c
index a1fb7f0..dd21366 100644
--- a/run.c
+++ b/run.c
@@ -1978,7 +1978,6 @@ static char *nawk_convert(const char *s, int (*fun_c)(int),
 	size_t n       = 0;
 	wchar_t wc;
 	const size_t sz = awk_mb_cur_max;
-	int unused;
 
 	if (sz == 1) {
 		buf = tostring(s);
@@ -1992,14 +1991,7 @@ static char *nawk_convert(const char *s, int (*fun_c)(int),
 		buf = tostringN(s, strlen(s) * sz + 1);
 
 		(void) mbtowc(NULL, NULL, 0);	/* reset internal state */
-		/*
-		 * Reset internal state here too.
-		 * Assign result to avoid a compiler warning. (Casting to void
-		 * doesn't work.)
-		 * Increment said variable to avoid a different warning.
-		 */
-		unused = wctomb(NULL, L'\0');
-		unused++;
+		(void) wctomb(NULL, L'\0');	/* reset internal state */
 
 		ps   = s;
 		pbuf = buf;