diff --git a/zuul/model.py b/zuul/model.py
index f9314d7..7deef06 100644
--- a/zuul/model.py
+++ b/zuul/model.py
@@ -255,7 +255,7 @@
             self._jobs |= set(self.pipeline.getJobTree(project).getJobs())
 
     def enqueueChange(self, change):
-        if self.queue:
+        if self.dependent and self.queue:
             change.change_ahead = self.queue[-1]
             change.change_ahead.change_behind = change
         self.queue.append(change)