diff --git a/modules/nextcloud.nix b/modules/nextcloud.nix
index c4ec12f..b8bd5a5 100644
--- a/modules/nextcloud.nix
+++ b/modules/nextcloud.nix
@@ -285,6 +285,14 @@ in {
           phone-numbers.
         '';
       };
+      defaultapp = mkOption {
+        default = null;
+        type = types.nullOr types.str;
+        example = "files";
+        description = ''
+          This options sets the app that opens as default.
+        '';
+      };
     };
 
     caching = {
@@ -477,6 +485,7 @@ in {
               ${optionalString cfg.caching.apcu "'memcache.local' => '\\OC\\Memcache\\APCu',"}
               'log_type' => 'syslog',
               'log_level' => '${builtins.toString cfg.logLevel}',
+              ${optionalString (c.defaultapp != null) "'defaultapp' => '${c.defaultapp}',"}
               ${optionalString (c.overwriteProtocol != null) "'overwriteprotocol' => '${c.overwriteProtocol}',"}
               ${optionalString (c.dbname != null) "'dbname' => '${c.dbname}',"}
               ${optionalString (c.dbhost != null) "'dbhost' => '${c.dbhost}',"}