diff --git a/src/cw/format_is_utf8.c b/src/cw/format_is_utf8.c
index b36ff7e1..724b508b 100644
--- a/src/cw/format_is_utf8.c
+++ b/src/cw/format_is_utf8.c
@@ -33,11 +33,9 @@
 int format_is_utf8(unsigned char *str, size_t len)
 {
 	size_t i = 0;
-	size_t j = 0;
 	size_t bytes = 0;
 
 	while (i < len) {
-		j = i;
 		if (str[i] < 0x20) {
 			return 0;
 		}