diff --git a/packages/ember/index.js b/packages/ember/index.js
index 8c415902eaa..3d2f063b5e6 100644
--- a/packages/ember/index.js
+++ b/packages/ember/index.js
@@ -275,6 +275,20 @@ Ember._tracked = metal.tracked;
 computed.alias = metal.alias;
 Ember.cacheFor = metal.getCachedValueFor;
 Ember.ComputedProperty = metal.ComputedProperty;
+Object.defineProperty(Ember, '_setComputedDecorator', {
+  get() {
+    deprecate(
+      'Please migrate from Ember._setComputedDecorator to Ember._setClassicDecorator',
+      false,
+      {
+        id: 'ember._setComputedDecorator',
+        until: '3.13.0',
+      }
+    );
+
+    return metal.setClassicDecorator;
+  },
+});
 Ember._setClassicDecorator = metal.setClassicDecorator;
 Ember.meta = meta;
 Ember.get = metal.get;
diff --git a/packages/ember/tests/reexports_test.js b/packages/ember/tests/reexports_test.js
index a3ada5b56c3..2c7f531a973 100644
--- a/packages/ember/tests/reexports_test.js
+++ b/packages/ember/tests/reexports_test.js
@@ -49,6 +49,12 @@ moduleFor(
         );
       }
     }
+
+    '@test Ember._setComputedDecorator is deprecated'() {
+      expectDeprecation(() => {
+        Ember._setComputedDecorator;
+      }, 'Please migrate from Ember._setComputedDecorator to Ember._setClassicDecorator');
+    }
   }
 );