diff --git a/util/board_status/to-wiki/bucketize.sh b/util/board_status/to-wiki/bucketize.sh
index 19a7c77c5e..a0d2e95679 100755
--- a/util/board_status/to-wiki/bucketize.sh
+++ b/util/board_status/to-wiki/bucketize.sh
@@ -4,7 +4,7 @@
 #   into buckets of the given granularity
 
 weekly() {
-	date --date="$1" +%YW%V
+	date --date="$1" +%GW%V
 }
 
 monthly() {