diff --git a/libexec/rbenv b/libexec/rbenv
index 1ad36c95..d77df669 100755
--- a/libexec/rbenv
+++ b/libexec/rbenv
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 set -e
-export -n CDPATH
+unset CDPATH
 
 if [ "$1" = "--debug" ]; then
   export RBENV_DEBUG=1