diff --git a/src/google/adk/evaluation/constants.py b/src/google/adk/evaluation/constants.py
index 74248ed18..0d14572d5 100644
--- a/src/google/adk/evaluation/constants.py
+++ b/src/google/adk/evaluation/constants.py
@@ -15,6 +15,6 @@
 from __future__ import annotations
 
 MISSING_EVAL_DEPENDENCIES_MESSAGE = (
-    "Eval module is not installed, please install via `pip install"
-    " google-adk[eval]`."
+    'Eval module is not installed, please install via `pip install'
+    ' "google-adk[eval]"`.'
 )