diff --git a/docker/postgres/init-databases.sh b/docker/postgres/init-databases.sh
index 887cb95..3395c33 100755
--- a/docker/postgres/init-databases.sh
+++ b/docker/postgres/init-databases.sh
@@ -4,18 +4,13 @@ set -euo pipefail
 # Create service metadata databases during the first Postgres initialization.
 create_database() {
 local database="1ドル"
- local exists
 
- exists="$(
- psql -v ON_ERROR_STOP=1 --username "$POSTGRES_USER" --dbname postgres --set=database="$database" \
- --tuples-only --no-align \
- --command "SELECT 1 FROM pg_database WHERE datname = :'database'"
- )"
+ psql -v ON_ERROR_STOP=1 --username "$POSTGRES_USER" --dbname postgres \
+ --command "SELECT 1 FROM pg_database WHERE datname = '$database'" \
+ --tuples-only --no-align | grep -q 1 && return 0
 
- if [[ "$exists" != "1" ]]; then
- psql -v ON_ERROR_STOP=1 --username "$POSTGRES_USER" --dbname postgres --set=database="$database" \
- --command 'CREATE DATABASE :"database"'
- fi
+ psql -v ON_ERROR_STOP=1 --username "$POSTGRES_USER" --dbname postgres \
+ --command "CREATE DATABASE \"$database\""
 }
 
 create_database "${KOIN_DATA_AIRFLOW_DB:-airflow_metadata}"
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