diff --git a/packages/streamable-fs/src/filehandle.ts b/packages/streamable-fs/src/filehandle.ts
index db1a20239..3d8054bd0 100644
--- a/packages/streamable-fs/src/filehandle.ts
+++ b/packages/streamable-fs/src/filehandle.ts
@@ -101,9 +101,9 @@ export default class FileHandle {
   async size() {
     let size = 0;
     for (const chunk of this.chunks) {
-      const array = await this.storage.readChunk(chunk);
-      if (!array) continue;
-      size += array.length;
+      const length = await this.storage.chunkSize(chunk);
+      if (!length) throw new Error(`Found 0 byte sized chunk.`);
+      size += length;
     }
     return size;
   }
diff --git a/packages/streamable-fs/src/interfaces.ts b/packages/streamable-fs/src/interfaces.ts
index 7869546f1..69f7e65f8 100644
--- a/packages/streamable-fs/src/interfaces.ts
+++ b/packages/streamable-fs/src/interfaces.ts
@@ -43,6 +43,7 @@ export interface IFileStorage {
   writeChunk(chunkName: string, data: Uint8Array): Promise<void>;
   deleteChunk(chunkName: string): Promise<void>;
   readChunk(chunkName: string): Promise<Uint8Array | undefined>;
+  chunkSize(chunkName: string): Promise<number>;
   listChunks(chunkPrefix: string): Promise<string[]>;
   list(): Promise<string[]>;
 }