diff --git a/test_util/src/lsp.rs b/test_util/src/lsp.rs
index fa362c13ef..92dc98102c 100644
--- a/test_util/src/lsp.rs
+++ b/test_util/src/lsp.rs
@@ -165,7 +165,7 @@ impl LspClient {
       .arg("lsp")
       .stdin(Stdio::piped())
       .stdout(Stdio::piped())
-      // .stderr(Stdio::null())
+      .stderr(Stdio::null())
       .spawn()?;
 
     let stdout = child.stdout.take().unwrap();