diff --git a/lib/pact_broker/client/base_client.rb b/lib/pact_broker/client/base_client.rb
index 2299579d..84734f64 100644
--- a/lib/pact_broker/client/base_client.rb
+++ b/lib/pact_broker/client/base_client.rb
@@ -119,7 +119,7 @@ def url_for_relation relation_name, params
           if relation
             url = relation['href']
             params.each do | (key, value) |
-              url = url.gsub("{#{key}}", value)
+              url = url.gsub("{#{key}}", encode_param(value))
             end
             url
           else