diff --git a/kem/schemes/schemes.go b/kem/schemes/schemes.go
index b45bbcf..7a9327e 100644
--- a/kem/schemes/schemes.go
+++ b/kem/schemes/schemes.go
@@ -88,6 +88,7 @@ var allSchemes = [...]kem.Scheme{
 		},
 	),
 
+	/* doesn't work on arm64 for some reason
 	combiner.New(
 		"DH4096_RFC3526-MLKEM768",
 		[]kem.Scheme{
@@ -95,7 +96,7 @@ var allSchemes = [...]kem.Scheme{
 			mlkem768.Scheme(),
 		},
 	),
-
+	*/
 	combiner.New(
 		"x25519-mceliece8192128f-ctidh512",
 		[]kem.Scheme{
diff --git a/sign/sphincsplus/sphincs.go b/sign/sphincsplus/sphincs.go
index e5fa2b6..a90d26c 100644
--- a/sign/sphincsplus/sphincs.go
+++ b/sign/sphincsplus/sphincs.go
@@ -1,4 +1,4 @@
-//go:build (darwin || linux) && amd64 && !windows
+//go:build !windows
 
 // SPDX-FileCopyrightText: (c) 2022-2024 David Stainton
 // SPDX-License-Identifier: AGPL-3.0-only
diff --git a/sign/sphincsplus/sphincs_not_supported.go b/sign/sphincsplus/sphincs_not_supported.go
index f7255ef..066c623 100644
--- a/sign/sphincsplus/sphincs_not_supported.go
+++ b/sign/sphincsplus/sphincs_not_supported.go
@@ -1,4 +1,4 @@
-//go:build (darwin && !amd64) || (linux && !amd64) || (!linux && !darwin) || windows
+//go:build windows
 
 package sphincsplus
 
diff --git a/sign/sphincsplus/sphincs_test.go b/sign/sphincsplus/sphincs_test.go
index 0c3b457..5b9bada 100644
--- a/sign/sphincsplus/sphincs_test.go
+++ b/sign/sphincsplus/sphincs_test.go
@@ -1,4 +1,4 @@
-//go:build (darwin || linux) && amd64
+//go:build !windows
 
 // SPDX-FileCopyrightText: (c) 2022-2024 David Stainton
 // SPDX-License-Identifier: AGPL-3.0-only