diff --git a/.changeset/bumpy-papers-clean.md b/.changeset/bumpy-papers-clean.md
new file mode 100644
index 0000000000..2f794963a8
--- /dev/null
+++ b/.changeset/bumpy-papers-clean.md
@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-scaffolder-backend': patch
+---
+
+Fixed a bug where config was not passed to NunjucksWorkflowRunner, causing defaultEnvironment to be undefined
diff --git a/plugins/scaffolder-backend/src/scaffolder/tasks/TaskWorker.ts b/plugins/scaffolder-backend/src/scaffolder/tasks/TaskWorker.ts
index 3a15b345db..ef704bc9e0 100644
--- a/plugins/scaffolder-backend/src/scaffolder/tasks/TaskWorker.ts
+++ b/plugins/scaffolder-backend/src/scaffolder/tasks/TaskWorker.ts
@@ -134,6 +134,7 @@ export class TaskWorker {
       additionalTemplateFilters,
       additionalTemplateGlobals,
       permissions,
+      config,
     });
 
     return new TaskWorker({