diff --git a/install.sh b/install.sh
index ca0a49f..445abb3 100644
--- a/install.sh
+++ b/install.sh
@@ -232,7 +232,11 @@ fi
 #########################
 
 NODE_VERSION=${NODE_VERSION:-}
-NODEJS_VER=${NODE_VERSION:-$NODEJS_VER}
+NODEJS_VER=${NODEJS_VER:-}
+if [ -z "${NODEJS_VER:-}" ]; then
+  NODEJS_VER=$NODE_VERSION
+fi
+
 if [ -z "${NODEJS_VER:-}" ]; then
   # For backwards compat
   if [ -f "$my_tmp/NODEJS_VER" ]; then