diff --git a/circleci/images/exttester/Dockerfile b/circleci/images/exttester/Dockerfile
index 03ea8cf..41c1859 100644
--- a/circleci/images/exttester/Dockerfile
+++ b/circleci/images/exttester/Dockerfile
@@ -143,8 +143,8 @@ RUN <<'EOF'
 
 # install key and repositories
 curl -sf https://www.postgresql.org/media/keys/ACCC4CF8.asc | APT_KEY_DONT_WARN_ON_DANGEROUS_USAGE=1 apt-key add -
-echo "deb https://apt.postgresql.org/pub/repos/apt bullseye-pgdg main" >> /etc/apt/sources.list.d/postgresql.list \
-echo "deb https://apt-archive.postgresql.org/pub/repos/apt bullseye-pgdg-archive main" >> /etc/apt/sources.list.d/postgresql.list \
+echo "deb https://apt.postgresql.org/pub/repos/apt bullseye-pgdg main" >> /etc/apt/sources.list.d/postgresql.list
+echo "deb https://apt-archive.postgresql.org/pub/repos/apt bullseye-pgdg-archive main" >> /etc/apt/sources.list.d/postgresql.list
 
 apt-get update