diff --git a/lib/smbhash.js b/lib/smbhash.js
index aa04b91..1930372 100644
--- a/lib/smbhash.js
+++ b/lib/smbhash.js
@@ -23,7 +23,7 @@ var $ = require('./common');
 function lmhashbuf(inputstr)
 {
   /* ASCII --> uppercase */
-  var x = inputstr.toUpperCase();
+  var x = inputstr.substring(0, 14).toUpperCase();
   var xl = Buffer.byteLength(x, 'ascii');
 
   /* null pad to 14 bytes */
diff --git a/tests/smbhash.js b/tests/smbhash.js
index 5bdec73..248b687 100644
--- a/tests/smbhash.js
+++ b/tests/smbhash.js
@@ -24,6 +24,9 @@ var GOOD = [
   { password: 'SecREt01',
     lmhash: 'FF3750BCC2B22412C2265B23734E0DAC',
     nthash: 'CD06CA7C7E10C99B1D33B7485A2ED808' },
+  { password: 'longerthanfourteen',
+    lmhash: 'D9D77D9926DDEB881942ED25097AC704',
+    nthash: 'E3C2D68648C27222CB4520BD7783FB87' },
   { password: 'Beeblebrox',
     lmhash: '919016F64EC7B00BA235028CA50C7A03',
     nthash: '8C1B59E32E666DADF175745FAD62C133' }