diff --git a/src/Bundle.js b/src/Bundle.js
index a138e95cbcd..b8b742a7f74 100644
--- a/src/Bundle.js
+++ b/src/Bundle.js
@@ -196,6 +196,8 @@ class Bundle {
 
     await packager.end();
 
+    this.totalSize = packager.getSize();
+
     let assetArray = Array.from(this.assets);
     let assetStartTime =
       this.type === 'map'
diff --git a/src/packagers/JSConcatPackager.js b/src/packagers/JSConcatPackager.js
index 39f27b69750..ef94d057ddf 100644
--- a/src/packagers/JSConcatPackager.js
+++ b/src/packagers/JSConcatPackager.js
@@ -505,7 +505,7 @@ class JSConcatPackager extends Packager {
       output = '(function () {' + output + '})();';
     }
 
-    this.bundle.totalSize = output.length;
+    this.size = output.length;
 
     let {sourceMaps} = this.options;
     if (sourceMaps) {