diff --git a/pkgs/servers/sql/postgresql/builder.sh b/pkgs/servers/sql/postgresql/builder.sh
index c2e8e8a01f03..0ecefd3a5453 100755
--- a/pkgs/servers/sql/postgresql/builder.sh
+++ b/pkgs/servers/sql/postgresql/builder.sh
@@ -1,5 +1,7 @@
 . $stdenv/setup
 
+export LANG=en_US
+
 configureFlags=""
 if test "$jdbcSupport"; then
     configureFlags="--with-java $configureFlags"