diff --git a/tts/launch_worker_3090.sh b/tts/launch_worker_3090.sh
index bd1f6ec..8add682 100755
--- a/tts/launch_worker_3090.sh
+++ b/tts/launch_worker_3090.sh
@@ -10,7 +10,7 @@
 
 set -euxo pipefail
 
-define -r WORKER_INDEX="$1"
+declare -r WORKER_INDEX="$1"
 
 # A dual 3090 can run eight jobs across two GPUs.
 case "${WORKER_INDEX}" in