diff --git a/juniper_codegen/src/util.rs b/juniper_codegen/src/util.rs
index 3182aedb..d6a71d59 100644
--- a/juniper_codegen/src/util.rs
+++ b/juniper_codegen/src/util.rs
@@ -901,7 +901,7 @@ impl GraphQLTypeDefiniton {
 
                     quote!(
                         #name => {
-                            let res #_type = { #code };
+                            let res #_type = (||{ #code })();
                             let res2 = #juniper_crate_name::IntoResolvable::into(
                                 res,
                                 executor.context()