diff --git a/packages/gatsby/src/state-machines/develop/index.ts b/packages/gatsby/src/state-machines/develop/index.ts
index b510a965778a0..e3a1f76b9909b 100644
--- a/packages/gatsby/src/state-machines/develop/index.ts
+++ b/packages/gatsby/src/state-machines/develop/index.ts
@@ -276,8 +276,6 @@ const developConfig: MachineConfig<IBuildContext, any, AnyEventObject> = {
         ADD_NODE_MUTATION: {
           actions: `callApi`,
         },
-        // Ignore, because we're about to extract them anyway
-        SOURCE_FILE_CHANGED: undefined,
       },
       invoke: {
         src: `reloadData`,