diff --git a/lib/generators/dockerfile_generator.rb b/lib/generators/dockerfile_generator.rb
index 28c14ab..9810731 100644
--- a/lib/generators/dockerfile_generator.rb
+++ b/lib/generators/dockerfile_generator.rb
@@ -1034,6 +1034,8 @@ def deploy_database
   end
 
   def node_version
+    return unless using_node? || using_execjs?
+
     version = nil
 
     if File.exist? ".node-version"