diff --git a/nixos/tests/all-tests.nix b/nixos/tests/all-tests.nix
index 03af2e0a1ecc..94614883b2d5 100644
--- a/nixos/tests/all-tests.nix
+++ b/nixos/tests/all-tests.nix
@@ -1409,7 +1409,9 @@ in
   syncthing-guiPassword = runTest ./syncthing/guiPassword.nix;
   syncthing-guiPasswordFile = runTest ./syncthing/guiPasswordFile.nix;
   syncthing-init = runTest ./syncthing/init.nix;
-  syncthing-many-devices = runTest ./syncthing/many-devices.nix;
+  # FIXME: Test has been failing since 2025-07-06:
+  # https://github.com/NixOS/nixpkgs/issues/447674
+  # syncthing-many-devices = runTest ./syncthing/many-devices.nix;
   syncthing-no-settings = runTest ./syncthing/no-settings.nix;
   syncthing-relay = runTest ./syncthing/relay.nix;
   sysfs = runTest ./sysfs.nix;
diff --git a/pkgs/applications/networking/syncthing/default.nix b/pkgs/applications/networking/syncthing/default.nix
index 9e8356ba0425..97b84cd59dbc 100644
--- a/pkgs/applications/networking/syncthing/default.nix
+++ b/pkgs/applications/networking/syncthing/default.nix
@@ -71,7 +71,6 @@ let
             syncthing-guiPassword
             syncthing-guiPasswordFile
             syncthing-init
-            syncthing-many-devices
             syncthing-no-settings
             syncthing-relay
             ;