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-rw-r--r--sys/src/cmd/cal.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/sys/src/cmd/cal.c b/sys/src/cmd/cal.c
index b2562fd84..9a12b4a88 100644
--- a/sys/src/cmd/cal.c
+++ b/sys/src/cmd/cal.c
@@ -54,6 +54,7 @@ main(int argc, char *argv[])
wstart = atoi(EARGF(usage()));
if(wstart < 0 || wstart > 7)
usage();
+ wstart %= 7;
break;
default:
usage();