diff --git a/sandbox/sandbox.plugin.zsh b/sandbox/sandbox.plugin.zsh
index 3071afa..f6db48d 100644
--- a/sandbox/sandbox.plugin.zsh
+++ b/sandbox/sandbox.plugin.zsh
@@ -1,9 +1,3 @@
-if [[ "" == $SANDBOX_ENV_IN_FILE ]]; then
-  export SANDBOX_ENV_IN_FILE=$AUTOENV_IN_FILE
-fi
-if [[ "" == $SANDBOX_ENV_OUT_FILE ]]; then
-  export SANDBOX_ENV_OUT_FILE=$AUTOENV_OUT_FILE
-fi
 if [[ "" == $SANDBOX_ROOT ]]; then
   export SANDBOX_ROOT=$HOME/Sandbox
 fi
@@ -33,11 +27,11 @@ sandbox() {
       begin=$PWD
       cd $sandbox
 
-      echo "SANDBOX_HOME=\$(dirname -- "\$0:a")" >> $SANDBOX_ENV_IN_FILE
-      echo "SANDBOX_NAME=$2" >> $SANDBOX_ENV_IN_FILE
+      echo "SANDBOX_HOME=\$(dirname -- "\$0:a")" >> .enter
+      echo "SANDBOX_NAME=$2" >> .enter
 
-      echo "unset SANDBOX_NAME" >> $SANDBOX_ENV_OUT_FILE
-      echo "unset SANDBOX_HOME" >> $SANDBOX_ENV_OUT_FILE
+      echo "unset SANDBOX_NAME" >> .exit
+      echo "unset SANDBOX_HOME" >> .exit
 
       git init &> /dev/null