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-rw-r--r--src/cmd/join.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/cmd/join.c b/src/cmd/join.c
index 1739ef5d..9ce127fe 100644
--- a/src/cmd/join.c
+++ b/src/cmd/join.c
@@ -355,7 +355,7 @@ oparse(char *s)
break;
case '1':
case '2':
- if(s[1] == '.' && isdigit(s[2])) {
+ if(s[1] == '.' && isdigit((uchar)s[2])) {
olistf[no] = *s=='1'? F1: F2;
olist[no] = atoi(s += 2);
break;