diff --git a/lib/nvm.zsh b/lib/nvm.zsh
index 5cadf706..61d997fc 100644
--- a/lib/nvm.zsh
+++ b/lib/nvm.zsh
@@ -1,6 +1,6 @@
 # get the node.js version
 function nvm_prompt_info() {
-  [ -f $HOME/.nvm/nvm.sh ] || return
+  [ -f "$HOME/.nvm/nvm.sh" ] || return
   local nvm_prompt
   nvm_prompt=$(node -v 2>/dev/null)
   [[ "${nvm_prompt}x" == "x" ]] && return