diff --git a/node_modules/browserify-sign/browser/index.js b/node_modules/browserify-sign/browser/index.js
index e6df44c..641e18e 100644
--- a/node_modules/browserify-sign/browser/index.js
+++ b/node_modules/browserify-sign/browser/index.js
@@ -11,6 +11,8 @@ Object.keys(algorithms).forEach(function (key) {
   algorithms[key.toLowerCase()] = algorithms[key]
 })
 
+algorithms['sha1'] = algorithms['RSA-SHA1']
+
 function Sign (algorithm) {
   stream.Writable.call(this)