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-rw-r--r--src/join.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/join.c b/src/join.c
index fb2064d4d..10a3999da 100644
--- a/src/join.c
+++ b/src/join.c
@@ -114,7 +114,7 @@ static struct outlist *outlist_end = &outlist_head;
/* Tab character separating fields; if this is NUL fields are separated
by any nonempty string of white space, otherwise by exactly one
tab character. */
-static char tab;
+static unsigned char tab;
/* When using getopt_long_only, no long option can start with
a character that is a short option. */