diff --git a/build-constraints.yaml b/build-constraints.yaml
index 67c8deb2..febc38f2 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -2488,10 +2488,10 @@ packages:
     "Kei Hibino <ex8k.hibino@gmail.com> @khibino":
         - th-data-compat
         - th-reify-compat
-        - relational-query < 0 # build failure with GHC 8.4
-        - relational-query-HDBC < 0 # build failure with GHC 8.4
-        - persistable-types-HDBC-pg < 0 # build failure with GHC 8.4
-        - relational-record < 0 # build failure with GHC 8.4
+        - relational-query
+        - relational-query-HDBC
+        - persistable-types-HDBC-pg
+        - relational-record
         - text-ldap
         - debian-build
         - aeson-generic-compat
@@ -3338,8 +3338,6 @@ packages:
         - data-memocombinators < 0 # build failure with GHC 8.4
         - hsshellscript < 0 # build failure with GHC 8.4
         - preprocessor-tools < 0 # build failure with GHC 8.4
-        - relational-schemas < 0 # build failure with GHC 8.4
-        - sql-words < 0 # build failure with GHC 8.4
         - tinytemplate < 0 # build failure with GHC 8.4
         - wai-route < 0 # BuildFailureException Process exited with ExitFailure 1: ./Setup build
         - wai-routing < 0 # DependencyFailed (PackageName "wai-route")