quick nc fix
diff --git a/authorization.go b/authorization.go
index 97811b7..7ffa85a 100644
--- a/authorization.go
+++ b/authorization.go
@@ -121,7 +121,7 @@
 	}
 
 	if ah.Nc != 0 {
-		buffer.WriteString(fmt.Sprintf("cnonce=%d, ", ah.Nc))
+		buffer.WriteString(fmt.Sprintf("nc=%08d, ", ah.Nc))
 	}
 
 	if ah.Opaque != "" {