diff --git a/bullet-train.zsh-theme b/bullet-train.zsh-theme
index 8f6907f..dba5a22 100644
--- a/bullet-train.zsh-theme
+++ b/bullet-train.zsh-theme
@@ -30,7 +30,10 @@ BULLETTRAIN_VIRTUALENV_BG=yellow
 BULLETTRAIN_VIRTUALENV_FG=white
 BULLETTRAIN_VIRTUALENV_PREFIX=🐍
 
-BULLETTRAIN_NVM_SHOW=true
+# NVM
+if [ ! -n "${BULLETTRAIN_NVM_SHOW+1}" ]; then
+  BULLETTRAIN_NVM_SHOW=true
+fi
 BULLETTRAIN_NVM_BG=green
 BULLETTRAIN_NVM_FG=white
 BULLETTRAIN_NVM_PREFIX="⬡ "