diff --git a/zsh.d/50_cdtmp.zsh b/zsh.d/50_cdtmp.zsh
index ea59079..24d8110 100644
--- a/zsh.d/50_cdtmp.zsh
+++ b/zsh.d/50_cdtmp.zsh
@@ -1,14 +1,17 @@
 # vim: ft=zsh
 
+export MY_TEMP_DIR_FILE="/tmp/${UID}_tmp_dir"
+
 function cdtmp {
-   if [ -z "$MY_TEMP_DIR" ]; then
+   if [ -z "$(cat $MY_TEMP_DIR_FILE 2> /dev/null)" ]; then
       newtmp
    fi
-   cd "$MY_TEMP_DIR"
+   cd "$(cat $MY_TEMP_DIR_FILE)" || return
 }
 
 function newtmp {
-   export MY_TEMP_DIR="$(mktemp -d)"
+   MY_TEMP_DIR="$(mktemp -d)"
+   echo "$MY_TEMP_DIR" > $MY_TEMP_DIR_FILE
    echo "new tmp dir in $MY_TEMP_DIR"
 }