diff --git a/modules/services/imapnotify-accounts.nix b/modules/services/imapnotify-accounts.nix
index 5d8418310..e437f94e3 100644
--- a/modules/services/imapnotify-accounts.nix
+++ b/modules/services/imapnotify-accounts.nix
@@ -1,4 +1,4 @@
-{ lib, ... }:
+{ pkgs, lib, ... }:
 
 with lib;
 
@@ -31,7 +31,7 @@ with lib;
     };
 
     extraConfig = mkOption {
-      type = with types; attrsOf (oneOf [ bool int str ]);
+      type = let jsonFormat = pkgs.formats.json { }; in jsonFormat.type;
       default = { };
       example = { wait = 10; };
       description = "Additional configuration to add for this account.";
diff --git a/modules/services/imapnotify.nix b/modules/services/imapnotify.nix
index bc595ca95..a79cba35e 100644
--- a/modules/services/imapnotify.nix
+++ b/modules/services/imapnotify.nix
@@ -99,7 +99,9 @@ in {
     };
 
     accounts.email.accounts = mkOption {
-      type = with types; attrsOf (submodule (import ./imapnotify-accounts.nix));
+      type = with types;
+        attrsOf
+        (submodule (import ./imapnotify-accounts.nix { inherit pkgs lib; }));
     };
   };