diff --git a/snapcraft.yaml b/snapcraft.yaml
index c2d3f21e..814040c6 100644
--- a/snapcraft.yaml
+++ b/snapcraft.yaml
@@ -61,7 +61,7 @@ parts:
 
     source: https://git.launchpad.net/curtin
     source-type: git
-    source-commit: 8e74f621e1bd84f804bda280a370440b150f9f40
+    source-commit: 6412598919202072d0d8b57827a120c963478d35
 
     override-pull: |
       craftctl default
diff --git a/subiquity/server/controllers/filesystem.py b/subiquity/server/controllers/filesystem.py
index 9656decc..21fed92c 100644
--- a/subiquity/server/controllers/filesystem.py
+++ b/subiquity/server/controllers/filesystem.py
@@ -27,7 +27,7 @@ from typing import Any, Dict, List, Optional, Set
 import attr
 
 from curtin.commands.extract import AbstractSourceHandler
-from curtin.storage_config import ptable_uuid_to_flag_entry
+from curtin.storage_config import ptable_part_type_to_flag
 
 import pyudev
 
@@ -673,7 +673,7 @@ class FilesystemController(SubiquityController, FilesystemManipulator):
             type_uuid = structure.gpt_part_type_uuid()
             if type_uuid:
                 part.partition_type = type_uuid
-                part.flag = ptable_uuid_to_flag_entry(type_uuid)[0]
+                part.flag = ptable_part_type_to_flag(type_uuid)
             if structure.name:
                 part.partition_name = structure.name
             if structure.filesystem: