diff --git a/packages/fuel-indexer-tests/trybuild/pass_if_indexer_is_valid_multi_type.rs b/packages/fuel-indexer-tests/trybuild/pass_if_indexer_is_valid_multi_type.rs
index 6fd0a8cb5..20c1c85aa 100644
--- a/packages/fuel-indexer-tests/trybuild/pass_if_indexer_is_valid_multi_type.rs
+++ b/packages/fuel-indexer-tests/trybuild/pass_if_indexer_is_valid_multi_type.rs
@@ -5,10 +5,10 @@ use fuel_indexer_utils::prelude::*;
 fn ff_log_data(_inp: ()) {}
 
 #[no_mangle]
-fn ff_put_object(_inp: ()) {}
+fn ff_put_object(_inp: ()) -> Result<(), ()> {}
 
 #[no_mangle]
-fn ff_put_many_to_many_record(_inp: ()) {}
+fn ff_put_many_to_many_record(_inp: ()) -> Result<(), ()> {}
 
 #[indexer(manifest = "packages/fuel-indexer-tests/trybuild/simple_wasm.yaml")]
 mod indexer {
diff --git a/packages/fuel-indexer-tests/trybuild/pass_if_indexer_is_valid_single_type.rs b/packages/fuel-indexer-tests/trybuild/pass_if_indexer_is_valid_single_type.rs
index dc6cd2e88..1d2a47eb1 100644
--- a/packages/fuel-indexer-tests/trybuild/pass_if_indexer_is_valid_single_type.rs
+++ b/packages/fuel-indexer-tests/trybuild/pass_if_indexer_is_valid_single_type.rs
@@ -5,10 +5,10 @@ use fuel_indexer_utils::prelude::*;
 fn ff_log_data(_inp: ()) {}
 
 #[no_mangle]
-fn ff_put_object(_inp: ()) {}
+fn ff_put_object(_inp: ()) -> Result<(), ()> {}
 
 #[no_mangle]
-fn ff_put_many_to_many_record(_inp: ()) {}
+fn ff_put_many_to_many_record(_inp: ()) -> Result<(), ()> {}
 
 #[indexer(manifest = "packages/fuel-indexer-tests/trybuild/simple_wasm.yaml")]
 mod indexer {