diff --git a/tests/test_issue4766_sidebar_source_pushdown.py b/tests/test_issue4766_sidebar_source_pushdown.py
index f804c464..a72087c6 100644
--- a/tests/test_issue4766_sidebar_source_pushdown.py
+++ b/tests/test_issue4766_sidebar_source_pushdown.py
@@ -101,6 +101,16 @@ def _extract_function(source_text, function_name):
     raise AssertionError(f"Could not extract {function_name}")
 
 
+def _ensure_async(function_source, function_name):
+    if function_source.startswith("async function "):
+        return function_source
+    return function_source.replace(
+        f"function {function_name}",
+        f"async function {function_name}",
+        1,
+    )
+
+
 def _run_node(script):
     proc = subprocess.run([NODE, "-e", script], capture_output=True, text=True, check=True)
     return json.loads(proc.stdout)
@@ -529,15 +539,13 @@ def test_scope_mismatch_error_path_respects_sidebar_source():
     requested_source_fn = _extract_function(src, "_requestedSessionSidebarSource")
     exclude_hidden_fn = _extract_function(src, "_sessionListExcludeHiddenEnabled")
     query_fn = _extract_function(src, "_sessionListQueryString")
-    fetch_helper_fn = _extract_function(src, "_loadSidebarSessionListPayload").replace(
-        "function _loadSidebarSessionListPayload",
-        "async function _loadSidebarSessionListPayload",
-        1,
+    fetch_helper_fn = _ensure_async(
+        _extract_function(src, "_loadSidebarSessionListPayload"),
+        "_loadSidebarSessionListPayload",
     )
-    refresh_fn = _extract_function(src, "_runRenderSessionListRefresh").replace(
-        "function _runRenderSessionListRefresh",
-        "async function _runRenderSessionListRefresh",
-        1,
+    refresh_fn = _ensure_async(
+        _extract_function(src, "_runRenderSessionListRefresh"),
+        "_runRenderSessionListRefresh",
     )
     script = f"""
 global.window = {{ _showCliSessions: true }};