diff --git a/scripts/build.sh b/scripts/build.sh
index 0f2a30c..8ab624d 100755
--- a/scripts/build.sh
+++ b/scripts/build.sh
@@ -15,6 +15,7 @@ else
 fi
 
 docker compose rm -vsf "$base_or_head"
+until ! pg_isready -p "$port" 1>/dev/null; do true; done;
 
 db() {
   echo -n "postgresql:///$1?port=$port&user=$POSTGRES_USER&password=$POSTGRES_PASSWORD"