diff -r 0c70d888a484 -r 74fb1842f8b9 mercurial/localrepo.py
--- a/mercurial/localrepo.py	Tue Aug 16 19:04:23 2022 +0200
+++ b/mercurial/localrepo.py	Tue Aug 16 20:09:31 2022 +0200
@@ -3662,7 +3662,7 @@
         requirements.discard(requirementsmod.REVLOGV1_REQUIREMENT)
         requirements.add(requirementsmod.REVLOGV2_REQUIREMENT)
     # experimental config: format.internal-phase
-    if ui.configbool(b'format', b'internal-phase'):
+    if ui.configbool(b'format', b'use-internal-phase'):
         requirements.add(requirementsmod.INTERNAL_PHASE_REQUIREMENT)
 
     # experimental config: format.exp-archived-phase