diff --git a/tools/theme_chooser.sh b/tools/theme_chooser.sh
index 50f80f092..af861a15b 100755
--- a/tools/theme_chooser.sh
+++ b/tools/theme_chooser.sh
@@ -20,7 +20,7 @@ function noyes() {
 
 function theme_preview() {
     THEME=$1
-    export ZDOTDIR="$(mktemp -d)"
+    export ZDOTDIR="$(mktemp -d tmp.zshXXXX)"
 
 cat <<-EOF >"$ZDOTDIR/.zshrc"
     source ~/.zshrc