diff --git a/util-linux-su.pamd b/util-linux-su.pamd
index 030657f..5733201 100644
--- a/util-linux-su.pamd
+++ b/util-linux-su.pamd
@@ -1,4 +1,5 @@
 #%PAM-1.0
+auth		required	pam_env.so
 auth		sufficient	pam_rootok.so
 # Uncomment the following line to implicitly trust users in the "wheel" group.
 #auth		sufficient	pam_wheel.so trust use_uid