diff --git a/overlays/default.nix b/overlays/default.nix
index 9bf8b1b..5d92b59 100644
--- a/overlays/default.nix
+++ b/overlays/default.nix
@@ -16,6 +16,4 @@
   };
 
   patches = import ./patches;
-  test-exclusions = import ./test-exclusions.nix;
-  x86-64-v3-workarounds = import ./x86-64-v3-workarounds.nix;
 }
diff --git a/overlays/x86-64-v3-workarounds.nix b/overlays/x86-64-v3-workarounds.nix
deleted file mode 100644
index 1796d20..0000000
--- a/overlays/x86-64-v3-workarounds.nix
+++ /dev/null
@@ -1,20 +0,0 @@
-# Output-validation workarounds for packages rebuilt with x86-64-v3.
-_final: prev:
-let
-  removeSiblingOutputChecks =
-    package:
-    package.overrideAttrs (old: {
-      # Nix 2.34 can validate a partial multi-output rebuild against only the
-      # outputs still being realised. PostgreSQL's checks then reject valid
-      # sibling names such as "out" and "lib". Keep the test suite and
-      # disallowed-requisite checks; accept the loss of cross-output checks.
-      outputChecks = builtins.mapAttrs (
-        _output: checks: builtins.removeAttrs checks [ "disallowedReferences" ]
-      ) (old.outputChecks or { });
-    });
-
-in
-prev.lib.optionalAttrs ((prev.stdenv.hostPlatform.gcc.arch or null) == "x86-64-v3") {
-  postgresql = removeSiblingOutputChecks prev.postgresql;
-  postgresql_18 = removeSiblingOutputChecks prev.postgresql_18;
-}