diff --git a/pwd.sh b/pwd.sh
index 92e9dd8..cc1edf5 100755
--- a/pwd.sh
+++ b/pwd.sh
@@ -7,7 +7,7 @@ set -o nounset
 set -o pipefail
 
 gpg=$(which gpg)
-safe=pwd.sh.safe
+safe=${PWDSH_SAFE:=pwd.sh.safe}
 
 
 fail () {