diff --git a/conda_forge_tick/make_migrators.py b/conda_forge_tick/make_migrators.py
index 773540d3a..5df163a6a 100644
--- a/conda_forge_tick/make_migrators.py
+++ b/conda_forge_tick/make_migrators.py
@@ -338,7 +338,7 @@ def add_rebuild_migration_yaml(
         piggy_back_migrations.append(Numpy2Migrator())
     if migration_name.startswith("r-base44"):
         piggy_back_migrations.append(RUCRTCleanup())
-    if migration_name.startswith("flang19"):
+    if migration_name.startswith("flang19") or migration_name.startswith("flang21"):
         piggy_back_migrations.append(FlangMigrator())
     if migration_name.startswith("xz_to_liblzma_devel"):
         piggy_back_migrations.append(