diff --git a/src/api/mod.rs b/src/api/mod.rs
index d07fd5bc..c199c680 100644
--- a/src/api/mod.rs
+++ b/src/api/mod.rs
@@ -157,7 +157,7 @@ impl ToTokens for Api {
             }
         } else {
             quote! {
-                let mut http_request = ::http::Request::new(());
+                let mut http_request = ::http::Request::new(Vec::with_capacity(0));
             }
         };