diff --git a/nixos/modules/config/swap.nix b/nixos/modules/config/swap.nix
index 968bb22f354c..e57ed2565a10 100644
--- a/nixos/modules/config/swap.nix
+++ b/nixos/modules/config/swap.nix
@@ -125,6 +125,8 @@ in
 
         createSwapDevice = sw:
           assert sw.device != "";
+          assert !(sw.randomEncryption && lib.hasPrefix "/dev/disk/by-uuid"  sw.device);
+          assert !(sw.randomEncryption && lib.hasPrefix "/dev/disk/by-label" sw.device);
           let realDevice' = escapeSystemdPath sw.realDevice;
           in nameValuePair "mkswap-${sw.deviceName}"
           { description = "Initialisation of swap device ${sw.device}";