diff --git a/index.js b/index.js
index bf0e7df..f1d3e32 100644
--- a/index.js
+++ b/index.js
@@ -61,7 +61,7 @@ module.exports = {
 
       if (!hasPlugin) {
         parentOptions.babel.plugins.push(
-          require.resolve('./lib/classic-decorator-transform-v2')
+          require.resolve('./lib/classic-decorator-transform-v3')
         );
       }
     }
diff --git a/lib/classic-decorator-transform-v2.js b/lib/classic-decorator-transform-v3.js
similarity index 91%
rename from lib/classic-decorator-transform-v2.js
rename to lib/classic-decorator-transform-v3.js
index 5365e76..a514471 100644
--- a/lib/classic-decorator-transform-v2.js
+++ b/lib/classic-decorator-transform-v3.js
@@ -37,7 +37,11 @@ module.exports = function(babel) {
         );
       },
 
-      ClassDeclaration(path) {
+      ClassDeclaration(path, state) {
+        if (state.classicDecoratorAnalysisAdded === true) {
+          return;
+        }
+
         if (path.node.id) {
           path.insertAfter(
             t.expressionStatement(
@@ -75,5 +79,9 @@ module.exports = function(babel) {
         }
       },
     },
+
+    post(state) {
+      state.classicDecoratorAnalysisAdded = true;
+    }
   };
 };
diff --git a/tests/unit/classic-decorator-test.js b/tests/unit/classic-decorator-test.js
index d0fb820..007bbb0 100644
--- a/tests/unit/classic-decorator-test.js
+++ b/tests/unit/classic-decorator-test.js
@@ -41,9 +41,13 @@ module('@classic', () => {
         const FooController = Controller.extend();
 
         @classic
-        class BarController extends FooController {}
+        class BarController extends FooController {
+          foo = 123;
+        }
 
-        class BazController extends BarController {}
+        class BazController extends BarController {
+          foo = 456;
+        }
 
         @classic
         class QuxController extends BazController {}
diff --git a/yarn.lock b/yarn.lock
index 0d8b3e4..312a0ec 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1270,6 +1270,13 @@ babel-plugin-debug-macros@^0.3.0:
   dependencies:
     semver "^5.3.0"
 
+babel-plugin-ember-modules-api-polyfill@^2.12.0:
+  version "2.12.0"
+  resolved "https://registry.yarnpkg.com/babel-plugin-ember-modules-api-polyfill/-/babel-plugin-ember-modules-api-polyfill-2.12.0.tgz#a5e703205ba4e625a7fab9bb1aea64ef3222cf75"
+  integrity sha512-ZQU4quX0TJ1yYyosPy5PFigKdCFEVHJ6H0b3hwjxekIP9CDwzk0OhQuKhCOPti+d52VWjjCjxu2BrXEih29mFw==
+  dependencies:
+    ember-rfc176-data "^0.3.12"
+
 babel-plugin-ember-modules-api-polyfill@^2.6.0, babel-plugin-ember-modules-api-polyfill@^2.9.0:
   version "2.9.0"
   resolved "https://registry.yarnpkg.com/babel-plugin-ember-modules-api-polyfill/-/babel-plugin-ember-modules-api-polyfill-2.9.0.tgz#8503e7b4192aeb336b00265e6235258ff6b754aa"
@@ -1840,6 +1847,23 @@ broccoli-babel-transpiler@^7.1.2, broccoli-babel-transpiler@^7.2.0:
     rsvp "^4.8.4"
     workerpool "^3.1.1"
 
+broccoli-babel-transpiler@^7.3.0:
+  version "7.3.0"
+  resolved "https://registry.yarnpkg.com/broccoli-babel-transpiler/-/broccoli-babel-transpiler-7.3.0.tgz#a0ad3a37dbf74469664bbca403d652070c2c1317"
+  integrity sha512-tsXNvDf3gp6g8rGkz234AhbaIRUsCdd6CM3ikfkJVB0EpC8ZAczGsFKTjENLy1etx4s7FkruW/QjI7Wfdhx6Ng==
+  dependencies:
+    "@babel/core" "^7.3.3"
+    "@babel/polyfill" "^7.0.0"
+    broccoli-funnel "^2.0.2"
+    broccoli-merge-trees "^3.0.2"
+    broccoli-persistent-filter "^2.2.1"
+    clone "^2.1.2"
+    hash-for-dep "^1.4.7"
+    heimdalljs-logger "^0.1.9"
+    json-stable-stringify "^1.0.1"
+    rsvp "^4.8.4"
+    workerpool "^3.1.1"
+
 broccoli-builder@^0.18.14:
   version "0.18.14"
   resolved "https://registry.yarnpkg.com/broccoli-builder/-/broccoli-builder-0.18.14.tgz#4b79e2f844de11a4e1b816c3f49c6df4776c312d"
@@ -2975,6 +2999,33 @@ ember-cli-babel@^7.0.0, ember-cli-babel@^7.1.2, ember-cli-babel@^7.1.3, ember-cl
     ensure-posix-path "^1.0.2"
     semver "^5.5.0"
 
+ember-cli-babel@^7.11.1:
+  version "7.12.0"
+  resolved "https://registry.yarnpkg.com/ember-cli-babel/-/ember-cli-babel-7.12.0.tgz#064997d199384be8c88d251f30ef67953d3bddc5"
+  integrity sha512-+EGQsbPvh19nNXHCm6rVBx2CdlxQlzxMyhey5hsGViDPriDI4PFYXYaFWdGizDrmZoDcG/Ywpeph3hl0NxGQTg==
+  dependencies:
+    "@babel/core" "^7.0.0"
+    "@babel/plugin-proposal-class-properties" "^7.3.4"
+    "@babel/plugin-proposal-decorators" "^7.3.0"
+    "@babel/plugin-transform-modules-amd" "^7.0.0"
+    "@babel/plugin-transform-runtime" "^7.2.0"
+    "@babel/polyfill" "^7.0.0"
+    "@babel/preset-env" "^7.0.0"
+    "@babel/runtime" "^7.2.0"
+    amd-name-resolver "^1.2.1"
+    babel-plugin-debug-macros "^0.3.0"
+    babel-plugin-ember-modules-api-polyfill "^2.12.0"
+    babel-plugin-module-resolver "^3.1.1"
+    broccoli-babel-transpiler "^7.3.0"
+    broccoli-debug "^0.6.4"
+    broccoli-funnel "^2.0.1"
+    broccoli-source "^1.1.0"
+    clone "^2.1.2"
+    ember-cli-babel-plugin-helpers "^1.1.0"
+    ember-cli-version-checker "^2.1.2"
+    ensure-posix-path "^1.0.2"
+    semver "^5.5.0"
+
 ember-cli-broccoli-sane-watcher@^3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/ember-cli-broccoli-sane-watcher/-/ember-cli-broccoli-sane-watcher-3.0.0.tgz#dc1812c047e1ceec4413d3c41b51a9ffc61b4cfe"
@@ -3296,6 +3347,11 @@ ember-resolver@^5.0.1:
     ember-cli-version-checker "^3.0.0"
     resolve "^1.10.0"
 
+ember-rfc176-data@^0.3.12:
+  version "0.3.12"
+  resolved "https://registry.yarnpkg.com/ember-rfc176-data/-/ember-rfc176-data-0.3.12.tgz#90d82878e69e2ac9a5438e8ce14d12c6031c5bd2"
+  integrity sha512-g9HeZj/gU5bfIIrGXkP7MhS2b3Vu5DfNUrYr14hy99TgIvtZETO+96QF4WOEUXGjIJdfTRjerVnQlqngPQSv1g==
+
 ember-rfc176-data@^0.3.9:
   version "0.3.9"
   resolved "https://registry.yarnpkg.com/ember-rfc176-data/-/ember-rfc176-data-0.3.9.tgz#44b6e051ead6c044ea87bd551f402e2cf89a7e3d"