diff --git a/cloudnativepg-configured/16/Dockerfile b/cloudnativepg-configured/16/Dockerfile
index 44adccf..82d06d4 100644
--- a/cloudnativepg-configured/16/Dockerfile
+++ b/cloudnativepg-configured/16/Dockerfile
@@ -20,6 +20,8 @@ RUN apt-get update \
     && apt-get remove -y lsb-release wget \
     && echo /tmp/* /var/lib/apt/lists/* | xargs rm -rf
 
+# build locale
+RUN localedef -i ja_JP -c -f UTF-8 -A /usr/share/locale/locale.alias ja_JP.UTF-8
 
 # Change the uid of postgres to 26
 USER 26