diff --git a/cloudnativepg-configured/16/Dockerfile b/cloudnativepg-configured/16/Dockerfile
index 3a9128e..75b36df 100644
--- a/cloudnativepg-configured/16/Dockerfile
+++ b/cloudnativepg-configured/16/Dockerfile
@@ -80,12 +80,13 @@ RUN apt-get update \
 # Install pgroonga
 RUN apt-get update  \
     && apt-get install -y lsb-release wget \
+    && lsb_release -c -s    \
     && wget "https://packages.groonga.org/debian/groonga-apt-source-latest-$(lsb_release -c -s).deb"  \
     && apt-get install -y -V ./groonga-apt-source-latest-$(lsb_release -c -s).deb   \
     && echo "deb http://apt.postgresql.org/pub/repos/apt/ $(lsb_release -c -s)-pgdg main" | tee /etc/apt/sources.list.d/pgdg.list  \
     && wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | apt-key add -    \
     && apt-get update   \
-    && apt install -y -V "postgresql-${PG_MAJOR}-pgdg-pgroonga" "groonga-tokenizer-mecab"   \
+    && apt-get install -y -V "postgresql-${PG_MAJOR}-pgdg-pgroonga" "groonga-tokenizer-mecab"   \
     && apt-get remove -y lsb-release wget \
     && apt-get autoremove -y \
     && apt-get clean \