diff --git a/pkgs/by-name/ma/matrix-tuwunel/package.nix b/pkgs/by-name/ma/matrix-tuwunel/package.nix
index 2ac745b9c1f21..939c89f4e1351 100644
--- a/pkgs/by-name/ma/matrix-tuwunel/package.nix
+++ b/pkgs/by-name/ma/matrix-tuwunel/package.nix
@@ -152,6 +152,8 @@ rustPlatform.buildRustPackage (finalAttrs: {
     libredirect.hook
   ];
 
+  # Make sure tuwunel doesn't try to write to arbitrary
+  # directories or have DNS timeouts during `cargo test`.
   preCheck =
     let
       fakeResolvConf = writeTextFile {
@@ -165,7 +167,16 @@ rustPlatform.buildRustPackage (finalAttrs: {
       export NIX_REDIRECTS="/etc/resolv.conf=${fakeResolvConf}"
       export TUWUNEL_DATABASE_PATH="$(mktemp -d)/smoketest.db"
     '';
-  doCheck = true;
+
+  # For some unexplained reason, tuwunel's built-in tests
+  # time out on aarch64 when run on Hydra.  The tests run
+  # without issue on x86-64 on Hydra and they also run fine
+  # on aarch64 on at least one dev's machine.
+  doCheck =
+    !(lib.elem stdenv.hostPlatform.system [
+      "aarch64-linux"
+      "aarch64-darwin"
+    ]);
 
   passthru = {
     rocksdb = rocksdb'; # make used rocksdb version available (e.g., for backup scripts)