diff --git a/subiquity/models/filesystem.py b/subiquity/models/filesystem.py
index 09724fcf..e1b9b6b8 100644
--- a/subiquity/models/filesystem.py
+++ b/subiquity/models/filesystem.py
@@ -318,7 +318,7 @@ class FilesystemModel(ModelPolicy):
                          dev.disk.partitions.items()]
             partitions += partnames
 
-        sorted(partitions)
+        partitions = sorted(partitions)
         log.debug('probe_storage: get_partitions() returns: {}'.format(
                   partitions))
         return partitions