diff --git a/setup-min.sh b/setup-min.sh
index 1ce4c78..9282c73 100644
--- a/setup-min.sh
+++ b/setup-min.sh
@@ -20,10 +20,10 @@ if [ -z "${PREFIX-}" ]; then
   PREFIX=""
 fi
 
-if [ -n "${NODE_PATH-}" ]; then
-  node_install_path=$(dirname $(dirname $NODE_PATH))
-else
+if [ -z "${NODE_PATH-}" ]; then
   node_install_path=$PREFIX/usr/local
+else
+  node_install_path=$(dirname $(dirname $NODE_PATH))
 fi
 
 NODEJS_NAME="node"