diff --git a/install.sh b/install.sh
index 5d330da..f4df77f 100644
--- a/install.sh
+++ b/install.sh
@@ -64,7 +64,7 @@ npm install --save
 npm install -g @vercel/ncc
 npx tsc
 
-if [[ -v $NVM_DIR ]]
+if [[ ! -v $NVM_DIR ]]
 then
   ln -s "$NVM_DIR/versions/node/$NODE_VERSION_STR/bin/ncc" "/usr/local/bin/ncc"
 fi