1 files changed, 1 insertions, 1 deletions
diff --git a/bin/ls/util.c b/bin/ls/util.c
index 172884c..65841b3 100644
--- a/bin/ls/util.c
+++ b/bin/ls/util.c
@@ -64,7 +64,7 @@ prn_printable(const char *s)
 	int n;
 
 	for (n = 0; (c = *s) != '\0'; ++s, ++n)
-		if (isprint(c))
+		if (isprint((unsigned char)c))
 			putchar(c);
 		else
 			putchar('?');