diff --git a/mappings.json b/mappings.json
index 73d33e9..9445b80 100644
--- a/mappings.json
+++ b/mappings.json
@@ -140,6 +140,12 @@
     "export": "setComponentManager",
     "deprecated": false
   },
+  {
+    "global": "Ember._setModifierManager",
+    "module": "@ember/modifier",
+    "export": "setModifierManager",
+    "deprecated": false
+  },
   {
     "global": "Ember.Checkbox",
     "module": "@ember/component/checkbox",