diff --git a/src/upgrader.js b/src/upgrader.js
index 25cb6d3f..ae023c43 100644
--- a/src/upgrader.js
+++ b/src/upgrader.js
@@ -253,7 +253,7 @@ class Upgrader {
           return { stream: { ...muxedStream, ...stream }, protocol }
         } catch (err) {
           log.error('could not create new stream', err)
-          throw errCode(err, codes.ERR_UNSUPPORTED_PROTOCOL)
+          throw errCode(new Error('Could not create a new stream'), codes.ERR_UNSUPPORTED_PROTOCOL, { cause: err })
         }
       }
 
diff --git a/test/upgrading/upgrader.spec.js b/test/upgrading/upgrader.spec.js
index 39c5c6c0..a4dfc1b6 100644
--- a/test/upgrading/upgrader.spec.js
+++ b/test/upgrading/upgrader.spec.js
@@ -339,6 +339,7 @@ describe('Upgrader', () => {
     results.forEach(result => {
       expect(result.isRejected).to.equal(true)
       expect(result.reason.code).to.equal(codes.ERR_UNSUPPORTED_PROTOCOL)
+      expect(result.reason.cause).to.exist()
     })
   })
 })