diff --git a/10/Dockerfile b/10/Dockerfile
index a3b460e079..37c4360f07 100644
--- a/10/Dockerfile
+++ b/10/Dockerfile
@@ -36,7 +36,7 @@ RUN set -x \
 	&& gosu nobody true \
 	&& apt-get purge -y --auto-remove ca-certificates wget
 
-# make the "en_US.UTF-8" locale so postgres will be utf-8 enabled by default
+# make the "es_ES.UTF-8" locale so postgres will be utf-8 enabled by default
 RUN set -eux; \
 	if [ -f /etc/dpkg/dpkg.cfg.d/docker ]; then \
 # if this file exists, we're likely in "debian:xxx-slim", and locales are thus being excluded so we need to remove that exclusion (since we need locales)
@@ -45,8 +45,8 @@ RUN set -eux; \
 		! grep -q '/usr/share/locale' /etc/dpkg/dpkg.cfg.d/docker; \
 	fi; \
 	apt-get update; apt-get install -y locales; rm -rf /var/lib/apt/lists/*; \
-	localedef -i en_US -c -f UTF-8 -A /usr/share/locale/locale.alias en_US.UTF-8
-ENV LANG en_US.utf8
+	localedef -i es_ES -c -f UTF-8 -A /usr/share/locale/locale.alias es_ES.UTF-8
+ENV LANG es_ES.utf8
 
 # install "nss_wrapper" in case we need to fake "/etc/passwd" and "/etc/group" (especially for OpenShift)
 # https://github.com/docker-library/postgres/issues/359