diff --git a/lib/constants.py b/lib/constants.py
index 80cb1627e8f110b3bd125c4dc2f4fd2cd0e3c79c..0d7b33d4f5db000424266a22ba7d92485a3170ec 100644
--- a/lib/constants.py
+++ b/lib/constants.py
@@ -1531,11 +1531,13 @@ IALLOCATOR_MODE_ALLOC = "allocate"
 IALLOCATOR_MODE_RELOC = "relocate"
 IALLOCATOR_MODE_CHG_GROUP = "change-group"
 IALLOCATOR_MODE_NODE_EVAC = "node-evacuate"
+IALLOCATOR_MODE_MULTI_ALLOC = "multi-allocate"
 VALID_IALLOCATOR_MODES = frozenset([
   IALLOCATOR_MODE_ALLOC,
   IALLOCATOR_MODE_RELOC,
   IALLOCATOR_MODE_CHG_GROUP,
   IALLOCATOR_MODE_NODE_EVAC,
+  IALLOCATOR_MODE_MULTI_ALLOC,
   ])
 IALLOCATOR_SEARCH_PATH = _autoconf.IALLOCATOR_SEARCH_PATH