diff --git a/server/app.js b/server/app.js
index 40f1674..102b8eb 100644
--- a/server/app.js
+++ b/server/app.js
@@ -107,6 +107,7 @@ function textRequestHandler(req, res, number, region, key) {
     message = ' ' + message;
   }
 
+  var shasum = crypto.createHash('sha1');
   shasum.update(number);
   var authbox_digest = shasum.digest('hex');
   _.extend(authbox_details, {