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-rw-r--r--sys/src/cmd/cal.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/sys/src/cmd/cal.c b/sys/src/cmd/cal.c
index cb70a243a..e14f41bc1 100644
--- a/sys/src/cmd/cal.c
+++ b/sys/src/cmd/cal.c
@@ -60,7 +60,7 @@ main(int argc, char *argv[])
Binit(&bout, 1, OWRITE);
dayw = dayws + 3*wstart;
- dayw[3*7] = '\0';
+ dayw[(3*7)-1] = '\0';
/*
* no arg, print current month