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-rw-r--r--usr.bin/calendar/io.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/usr.bin/calendar/io.c b/usr.bin/calendar/io.c
index d12783f..f1ba1ae 100644
--- a/usr.bin/calendar/io.c
+++ b/usr.bin/calendar/io.c
@@ -163,7 +163,7 @@ cal(void)
continue;
/* Trim spaces in front of the tab */
- while (isspace(pp[-1]))
+ while (isspace((unsigned char)pp[-1]))
pp--;
p = *pp;
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