diff --git a/conn.go b/conn.go
index eea4344..20598c8 100644
--- a/conn.go
+++ b/conn.go
@@ -120,7 +120,7 @@ func maskBytes(key [4]byte, pos int, b []byte) int {
 
 func newMaskKey() [4]byte {
 	n := rand.Uint32()
-	return [4]byte{byte(n), byte(n >> 8), byte(n >> 16), byte(n >> 32)}
+	return [4]byte{byte(n), byte(n >> 8), byte(n >> 16), byte(n >> 24)}
 }
 
 // Conn represents a WebSocket connection.
diff --git a/examples/autobahn/README.md b/examples/autobahn/README.md
index 348a24a..075ac15 100644
--- a/examples/autobahn/README.md
+++ b/examples/autobahn/README.md
@@ -10,4 +10,4 @@ and start the client test driver
 
     wstest -m fuzzingclient -s fuzzingclient.json
 
-When the client completes, it writes a report to reports/servers/index.html.
+When the client completes, it writes a report to reports/clients/index.html.