diff --git a/zsh-nvm.plugin.zsh b/zsh-nvm.plugin.zsh
index c57dee0..2b9a474 100644
--- a/zsh-nvm.plugin.zsh
+++ b/zsh-nvm.plugin.zsh
@@ -1,3 +1,7 @@
+if [ -z "$NVM_DIR" ]; then
+  NVM_DIR="$HOME/.nvm"
+fi
+
 _zsh_nvm_has() {
   type "$1" > /dev/null 2>&1
 }