--- a/ruby-tools/src/main/java/de/saumya/mojo/ruby/rails/RailsService.java
+++ b/ruby-tools/src/main/java/de/saumya/mojo/ruby/rails/RailsService.java
@@ -23,7 +23,7 @@
             final ScriptFactory factory, final GemManager gemManager,
             final RailsManager manager) throws RailsException, IOException {
         assert state != null;
-        assert this.session != null;
+        assert repositorySystemSession != null;
         assert factory != null;
         assert manager != null;