diff --git a/README.md b/README.md
index f4031ff..2eed580 100644
--- a/README.md
+++ b/README.md
@@ -70,8 +70,8 @@ antigen bundle lukechilds/zsh-nvm
 Performance comparison:
 
 ```shell
-% time (source $NVM_DIR/nvm.sh)
-( source $NVM_DIR/nvm.sh; )  0.58s user 0.37s system 109% cpu 0.874 total
+% time (source "$NVM_DIR/nvm.sh")
+( source "$NVM_DIR/nvm.sh"; )  0.58s user 0.37s system 109% cpu 0.874 total
 
 % time (_zsh_nvm_lazy_load)
 ( _zsh_nvm_lazy_load; )  0.01s user 0.01s system 168% cpu 0.012 total