diff -r efc76b1563f0 -r aaf8742e09a0 hgext3rd/topic/stack.py
--- a/hgext3rd/topic/stack.py	Tue Sep 03 13:02:20 2019 +0700
+++ b/hgext3rd/topic/stack.py	Fri Sep 06 12:16:34 2019 +0700
@@ -88,6 +88,9 @@
 
     @util.propertycache
     def _dependencies(self):
+        return self.builddependencies()
+
+    def builddependencies(self):
         deps, rdeps = builddependencies(self._repo, self._revs)
 
         repo = self._repo
@@ -143,7 +146,7 @@
         # processed dependency graph.
 
         # Step 1: compute relation of revision with each other
-        dependencies, rdependencies = self._dependencies
+        dependencies, rdependencies = self.builddependencies()
         dependencies = dependencies.copy()
         rdependencies = rdependencies.copy()
         # Step 2: Build the ordering