diff --git a/nixos/modules/services/misc/evremap.nix b/nixos/modules/services/misc/evremap.nix
index a82719f897170c..ee433aecbf5fd2 100644
--- a/nixos/modules/services/misc/evremap.nix
+++ b/nixos/modules/services/misc/evremap.nix
@@ -10,7 +10,7 @@ let
   settings = lib.attrsets.filterAttrs (n: v: v != null) cfg.settings;
   configFile = format.generate "evremap.toml" settings;
 
-  key = lib.types.strMatching "(BTN|KEY)_[[:upper:]]+" // {
+  key = lib.types.strMatching "(BTN|KEY)_[[:upper:][:digit:]_]+" // {
     description = "key ID prefixed with BTN_ or KEY_";
   };