diff --git a/nixos/modules/services/audio/slimserver.nix b/nixos/modules/services/audio/slimserver.nix
index 0f124505addf..c699881811c0 100644
--- a/nixos/modules/services/audio/slimserver.nix
+++ b/nixos/modules/services/audio/slimserver.nix
@@ -52,6 +52,11 @@ in
         User = "slimserver";
         # Issue 40589: Disable broken image/video support (audio still works!)
         ExecStart = "${lib.getExe cfg.package} --logdir ${cfg.dataDir}/logs --prefsdir ${cfg.dataDir}/prefs --cachedir ${cfg.dataDir}/cache --noimage --novideo";
+        # Allow only IPv4 since slimserver breaks with IPv6
+        RestrictAddressFamilies = [
+          "AF_INET"
+          "AF_UNIX"
+        ];
       };
     };