diff --git a/src/asar.ts b/src/asar.ts
index aeec84d..f2f6013 100644
--- a/src/asar.ts
+++ b/src/asar.ts
@@ -86,17 +86,17 @@ export class Asar extends DirectoryEntry {
     if (asarBytes) {
       // Read header size
       debug(2, "[new Asar] Reading header size");
-      const headerSize =
-        createFromBuffer(asarBytes.subarray(0, 16))
-          .createIterator()
-          .readUInt32() + 16;
+      const headerSize = createFromBuffer(asarBytes.subarray(0, 8))
+        .createIterator()
+        .readUInt32();
       debug(2, "[new Asar] Header size:", headerSize);
 
       // Read header
-      // We start at 16 because 0-8 are the Pickle object containing
-      // the header size, and 9-15 are the header size itself
+      // We start at 8 because 0-8 are the Pickle object containing the header size
       debug(2, "[new Asar] Reading header");
-      const rawHeader = asarBytes.subarray(16, headerSize).toString();
+      const rawHeader = createFromBuffer(asarBytes.subarray(8, 8 + headerSize))
+        .createIterator()
+        .readString();
       const header = JSON.parse(rawHeader) as unknown;
 
       if (opts.noHeaderTypeChecks) {