diff --git a/src/utils/collection.ts b/src/utils/collection.ts
index f8d397d7..8c54e85c 100644
--- a/src/utils/collection.ts
+++ b/src/utils/collection.ts
@@ -6,7 +6,7 @@ export function isCollection(data: unknown): data is Collection {
     return false
   }
 
-  return data.every(entry => typeof entry === 'object' && entry.path && entry.size)
+  return data.every(entry => typeof entry === 'object' && entry.path && entry.size !== undefined)
 }
 
 export function assertCollection(data: unknown): asserts data is Collection {
diff --git a/src/utils/tar.browser.ts b/src/utils/tar.browser.ts
index 680db160..d7c2d57e 100644
--- a/src/utils/tar.browser.ts
+++ b/src/utils/tar.browser.ts
@@ -25,6 +25,7 @@ export class TarStream {
 
   async endFile() {
     const padding = this.currentFileSize % 512 === 0 ? 0 : 512 - (this.currentFileSize % 512)
+
     if (padding > 0) {
       this.pieces.push(new Uint8Array(padding))
     }
diff --git a/src/utils/tar.ts b/src/utils/tar.ts
index 045a7c8e..4602b4cf 100644
--- a/src/utils/tar.ts
+++ b/src/utils/tar.ts
@@ -25,6 +25,7 @@ export class TarStream {
 
   async endFile() {
     const padding = this.currentFileSize % 512 === 0 ? 0 : 512 - (this.currentFileSize % 512)
+
     if (padding > 0) {
       this.output.write(Buffer.alloc(padding, 0))
     }