diff --git a/build-constraints.yaml b/build-constraints.yaml
index 60d7f347..b4bf74ed 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -1734,7 +1734,7 @@ packages:
 
     "Lars Kuhtz <lakuhtz@gmail.com> @larskuhtz":
         - wai-cors
-        # - configuration-tools # build failure with GHC 8.4 ttps://github.com/alephcloud/hs-configuration-tools/issues/65
+        - configuration-tools
 
     "Sam Rijs <srijs@airpost.net> @srijs":
         - ndjson-conduit
@@ -3276,7 +3276,6 @@ packages:
         - b9 < 0 # build failure with GHC 8.4 https://github.com/sheyll/b9-vm-image-builder/issues/4
         - biocore < 0 # build failure with GHC 8.4 https://github.com/fpco/stackage/pull/3359
         - cabal-rpm < 0 # build failure with GHC 8.4 https://github.com/juhp/cabal-rpm/issues/55
-        - configuration-tools < 0 # build failure with GHC 8.4 https://github.com/alephcloud/hs-configuration-tools/issues/65
         - dom-parser < 0 # build failure with GHC 8.4 https://github.com/typeable/dom-parser/issues/10
         - enummapset < 0 # build failure with GHC 8.4 https://github.com/michalt/enummapset/issues/11
         - fb < 0 # build failure with GHC 8.4 https://github.com/psibi/fb/issues/3