--- a/components/webapk/android/libs/client/src/org/chromium/components/webapk/lib/client/WebApkVerifySignature.java
+++ b/components/webapk/android/libs/client/src/org/chromium/components/webapk/lib/client/WebApkVerifySignature.java
@@ -454,7 +454,7 @@ public class WebApkVerifySignature {
      * @return short value read (as an int).
      */
     private int read2() {
-        return mBuffer.getShort();
+        return mBuffer.getShort() & 0xFFFF;
     }

     /**