diff --git a/build-constraints.yaml b/build-constraints.yaml
index fd5e83cd..e881afca 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -507,9 +507,9 @@ packages:
         - code-builder
         - fay-builder
         - generic-aeson
+        - generic-xmlpickler
         - hxt-pickle-utils
         - imagesize-conduit
-        - imagesize-conduit
         - json-schema
         - multipart
         - regular-xmlpickler
@@ -522,8 +522,6 @@ packages:
         - rest-types
         - rest-wai
         - tostring
-        - tostring
-        - uri-encode
         - uri-encode
 
     "Simon Michael <simon@joyful.com>":