diff --git a/src/lib.zig b/src/lib.zig
index 26e8709ec6de2bc84b2d22032583e7a526e7d0fe..f693e8382b9092d3656ca68dbbd85a2d3c550f8c 100644
--- a/src/lib.zig
+++ b/src/lib.zig
@@ -228,8 +228,8 @@ pub fn Handlers(comptime T: type) type {
         pub var clients: []Client = &.{};
         pub var callbackPath: string = "";
 
-        pub fn login(_: T.Ctx, response: *http.Response, request: http.Request, args: struct {}) !void {
-            _ = args;
+        pub fn login(_: T.Ctx, response: *http.Response, request: http.Request, captures: ?*const anyopaque) !void {
+            std.debug.assert(captures == null);
 
             const alloc = request.arena;
             const query = try request.context.uri.queryParameters(alloc);
@@ -251,8 +251,8 @@ pub fn Handlers(comptime T: type) type {
             });
         }
 
-        pub fn callback(_: T.Ctx, response: *http.Response, request: http.Request, args: struct {}) !void {
-            _ = args;
+        pub fn callback(_: T.Ctx, response: *http.Response, request: http.Request, captures: ?*const anyopaque) !void {
+            std.debug.assert(captures == null);
 
             const alloc = request.arena;
             const query = try request.context.uri.queryParameters(alloc);