diff --git a/nixos/modules/services/networking/murmur.nix b/nixos/modules/services/networking/murmur.nix
index 8f72e3c52b84..65c6725d8f50 100644
--- a/nixos/modules/services/networking/murmur.nix
+++ b/nixos/modules/services/networking/murmur.nix
@@ -386,6 +386,7 @@ in
         PrivateMounts = true;
         PrivateTmp = true;
         PrivateUsers = true;
+        ProcSubset = "pid";
         ProtectClock = true;
         ProtectControlGroups = "strict";
         ProtectHome = true;