diff --git a/src/ssn/readSsnFile.ts b/src/ssn/readSsnFile.ts
index 7d36aeb..92ba6e2 100644
--- a/src/ssn/readSsnFile.ts
+++ b/src/ssn/readSsnFile.ts
@@ -122,6 +122,7 @@ export default function readSsnFile(buffer: ArrayBuffer): ISsnFileEntry[] {
             throw new Error(`Password is too long, it should be 120 characters at most but it is ${fieldLength} characters long.`);
           }
           encodedPassword = new Uint8Array(buffer, pos, fieldLength);
+          pos += fieldLength;
           break;
         }
         case 0x80AE: //diff type
@@ -137,8 +138,8 @@ export default function readSsnFile(buffer: ArrayBuffer): ISsnFileEntry[] {
           break;
         default:
           //unknown field, ignore it
+          pos += fieldLength;
       }
-      pos += fieldLength;
     }
     pos += fileCommentLength;