diff --git a/quickwit/quickwit-codegen/example/Cargo.toml b/quickwit/quickwit-codegen/example/Cargo.toml
index 38b03f51f6a..e6380b1fb20 100644
--- a/quickwit/quickwit-codegen/example/Cargo.toml
+++ b/quickwit/quickwit-codegen/example/Cargo.toml
@@ -16,6 +16,7 @@ async-trait = { workspace = true }
 bytesize = { workspace = true }
 futures = { workspace = true }
 http = { workspace = true }
+mockall = { workspace = true, optional = true }
 prost = { workspace = true }
 serde = { workspace = true }
 thiserror = { workspace = true }
@@ -38,4 +39,4 @@ quickwit-actors = { workspace = true, features = ["testsuite"] }
 quickwit-codegen = { workspace = true }
 
 [features]
-testsuite = []
+testsuite = ["mockall"]