diff --git a/crates/agent_ui/src/acp/message_editor.rs b/crates/agent_ui/src/acp/message_editor.rs
index 994233bb30ca07e5be6979d17357f4a2c689d8e0..61a1ff3558b1fac4a9f3cbfca7debfbf254e1b84 100644
--- a/crates/agent_ui/src/acp/message_editor.rs
+++ b/crates/agent_ui/src/acp/message_editor.rs
@@ -1670,7 +1670,7 @@ mod tests {
                     trigger_kind: CompletionTriggerKind::TRIGGER_CHARACTER,
                     trigger_character: Some("@".into()),
                 },
-                "@",
+                Some("@"),
                 window,
                 cx,
             )