diff --git a/setup-node-mavericks.bash b/setup-node-mavericks.bash
index 6b98fe7..2c73061 100644
--- a/setup-node-mavericks.bash
+++ b/setup-node-mavericks.bash
@@ -8,7 +8,7 @@ if [ -z "${PREFIX-}" ]; then
   PREFIX=""
 fi
 
-if [ -z "$NODE_PATH" ]; then
+if [ -n "$NODE_PATH" ]; then
   node_install_path=$(dirname $(dirname $NODE_PATH))
 else
   node_install_path=$PREFIX/usr/local