diff --git a/functions b/functions
index 75f5514..9ff92fb 100755
--- a/functions
+++ b/functions
@@ -18,7 +18,7 @@ service_connect() {
   local SERVICE_TTY_OPTS
   has_tty && SERVICE_TTY_OPTS="-t"
 
-  docker exec -i $SERVICE_TTY_OPTS "$SERVICE_NAME" mongo -u "$SERVICE" -p "$PASSWORD" --authenticationDatabase "$DATABASE_NAME" "$DATABASE_NAME"
+  docker exec --env=LANG=C.UTF-8 --env=LC_ALL=C.UTF-8 -i $SERVICE_TTY_OPTS "$SERVICE_NAME" mongo -u "$SERVICE" -p "$PASSWORD" --authenticationDatabase "$DATABASE_NAME" "$DATABASE_NAME"
 }
 
 service_create() {
diff --git a/subcommands/connect-admin b/subcommands/connect-admin
index 5e12804..2de7c88 100755
--- a/subcommands/connect-admin
+++ b/subcommands/connect-admin
@@ -21,7 +21,7 @@ service-connect-admin-cmd() {
   PASSWORD="$(service_root_password "$SERVICE")"
   has_tty && SERVICE_TTY_OPTS="-t"
 
-  docker exec -i $SERVICE_TTY_OPTS "$SERVICE_NAME" mongo -u admin -p "$PASSWORD" --authenticationDatabase admin "$SERVICE"
+  docker exec --env=LANG=C.UTF-8 --env=LC_ALL=C.UTF-8 -i $SERVICE_TTY_OPTS "$SERVICE_NAME" mongo -u admin -p "$PASSWORD" --authenticationDatabase admin "$SERVICE"
 }
 
 service-connect-admin-cmd "$@"