diff --git a/xplan-resources/xplan-sql-scripts/Dockerfile b/xplan-resources/xplan-sql-scripts/Dockerfile
index 47844051b3fa9d8123d272afee03f5df954d1065..7ad79cbe2aaf2201b7416c6ae01b765d95ab8039 100644
--- a/xplan-resources/xplan-sql-scripts/Dockerfile
+++ b/xplan-resources/xplan-sql-scripts/Dockerfile
@@ -16,8 +16,10 @@ LABEL "org.opencontainers.image.created"="$BUILD_DATE" \
 	"org.opencontainers.image.version"="$XPLANBOX_VERSION" \
 	"maintainer"=""
 
-ENV TZ=Europe/Berlin \
-  LC_TIME=en_US
+ENV TZ=Europe/Berlin
+ENV LC_TIME=en_US
+ENV LC_ALL="en_US.UTF-8"
+ENV LC_CTYPE="en_US.UTF-8"
 
 # sets superuser and password for PG instance
 ENV POSTGRES_USER=postgres