diff --git a/src/kemal/context.cr b/src/kemal/context.cr
index a198ea4..d522262 100644
--- a/src/kemal/context.cr
+++ b/src/kemal/context.cr
@@ -3,7 +3,7 @@
 class HTTP::Server
   class Context
     def params
-      @request.url_params = route_lookup.params
+      @request.url_params ||= route_lookup.params
       @params ||= Kemal::ParamParser.new(@request)
     end