diff --git a/lib.js b/lib.js
index 948d197..e03385e 100644
--- a/lib.js
+++ b/lib.js
@@ -468,7 +468,7 @@ export const populateSource = (source, postReducerCallback, lock) => {
   let sourceLock = lock.sources[source.name] ??= {}
 
   source.posts = []
-  source = processRss(source, sourceLock.timestamp ?? 0, postReducerCallback)
+  source = processRss(source, sourceLock.timestamp ?? 0, postReducerCallback, lock)
 
   if(sourceLock.items) {
     for(let itemText of sourceLock.items) {
@@ -479,6 +479,7 @@ export const populateSource = (source, postReducerCallback, lock) => {
   }
 
   lock.sources[source.name] = sourceLock
+  lockSource(source, lock)
   return source
 }