diff --git a/nixos/modules/services/web-apps/codimd.nix b/nixos/modules/services/web-apps/codimd.nix
index 5368e8b0e66..5b4a53f00ed 100644
--- a/nixos/modules/services/web-apps/codimd.nix
+++ b/nixos/modules/services/web-apps/codimd.nix
@@ -834,7 +834,7 @@ in
                 IdP authentication endpoint.
               '';
             };
-            idPCert = mkOption {
+            idpCert = mkOption {
               type = types.str;
               default = "";
               example = "/path/to/cert.pem";