diff --git a/packages/@ember/canary-features/index.ts b/packages/@ember/canary-features/index.ts
index 1008c8cafbb..4a2b4da6792 100644
--- a/packages/@ember/canary-features/index.ts
+++ b/packages/@ember/canary-features/index.ts
@@ -20,7 +20,7 @@ export const DEFAULT_FEATURES = {
   EMBER_ENGINES_MOUNT_PARAMS: true,
   EMBER_MODULE_UNIFICATION: null,
   GLIMMER_CUSTOM_COMPONENT_MANAGER: true,
-  GLIMMER_MODIFIER_MANAGER: null,
+  GLIMMER_MODIFIER_MANAGER: true,
   EMBER_METAL_TRACKED_PROPERTIES: null,
   EMBER_GLIMMER_ANGLE_BRACKET_INVOCATION: true,
   EMBER_GLIMMER_ARRAY_HELPER: null,