diff --git a/lib/opcodes.py b/lib/opcodes.py
index b623f04bbf1bb5bb4e252ead1e8cd8c7dabe0dcd..6d073fcaf6bbac13ebdaae3c9de219c340fdc670 100644
--- a/lib/opcodes.py
+++ b/lib/opcodes.py
@@ -1029,7 +1029,7 @@ class OpAddGroup(OpCode):
 
 class OpAssignGroupNodes(OpCode):
   """Assign nodes to a node group."""
-  OP_ID = "OP_ASSIGN_NODES"
+  OP_ID = "OP_GROUP_ASSIGN_NODES"
   OP_DSC_FIELD = "group_name"
   OP_PARAMS = [
     _PGroupName,