diff --git a/index.js b/index.js
index a5f2e33..d99c3bd 100644
--- a/index.js
+++ b/index.js
@@ -30,7 +30,10 @@ const analyze = (bundle, opts = {}, format = false) => {
 
     let modules = bundleModules.map((m, i) => {
       let id = m.id.replace(root, '');
-      let size = m.renderedLength || Buffer.byteLength(m.code, 'utf8') || 0;
+      let size = m.renderedLength;
+      if (!size && size !== 0) {
+        size = m.code ? Buffer.byteLength(m.code, 'utf8') : 0;
+      }
       bundleSize += size;
 
       if (Array.isArray(filter) && !filter.some((f) => id.match(f))) return null
diff --git a/module.js b/module.js
index b85530d..7516385 100644
--- a/module.js
+++ b/module.js
@@ -28,7 +28,10 @@ export const analyze = (bundle, opts = {}, format = false) => {
 
     let modules = bundleModules.map((m, i) => {
       let id = m.id.replace(root, '')
-      let size = m.renderedLength || Buffer.byteLength(m.code, 'utf8') || 0
+      let size = m.renderedLength
+      if (!size && size !== 0) {
+        size = m.code ? Buffer.byteLength(m.code, 'utf8') : 0
+      }
       bundleSize += size
 
       if (Array.isArray(filter) && !filter.some((f) => id.match(f))) return null
diff --git a/package.json b/package.json
index 698af05..de55ea4 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "rollup-analyzer",
-  "version": "2.0.0-beta.1",
+  "version": "2.0.0-beta.2",
   "description": "Analyze file sizes of rollup bundled imports",
   "main": "index.js",
   "module": "module.js",