diff --git a/zuul/model.py b/zuul/model.py
index c6841c5..56d2d29 100644
--- a/zuul/model.py
+++ b/zuul/model.py
@@ -507,7 +507,9 @@
         return self.newrev
 
     def equals(self, other):
-        if self.ref == other.ref and self.newrev == other.newrev:
+        if (self.project == other.project
+            and self.ref == other.ref
+            and self.newrev == other.newrev):
             return True
         return False