diff --git a/nix/pkgs/pomerium/module.nix b/nix/pkgs/pomerium/module.nix
index 022a98f9e9..c5134cc219 100644
--- a/nix/pkgs/pomerium/module.nix
+++ b/nix/pkgs/pomerium/module.nix
@@ -6,7 +6,7 @@ let
   goDuration = types.mkOptionType {
     name = "goDuration";
     description = "Go duration (https://golang.org/pkg/time/#ParseDuration)";
-    check = x: types.str.check x && builtins.match "(-?[0-9]+(\.[0-9]+)?(ns|us|µs|ms|s|m|h))+" x != null;
+    check = x: types.str.check x && builtins.match "((-?[0-9]+(\.[0-9]+)?(ns|us|µs|ms|s|m|h))+|0)" x != null;
     inherit (types.str) merge;
   };
 in