diff --git a/python/sglang/check_env.py b/python/sglang/check_env.py
index 1b5828c46..d611b8127 100644
--- a/python/sglang/check_env.py
+++ b/python/sglang/check_env.py
@@ -22,7 +22,7 @@ PACKAGE_LIST = [
     "huggingface_hub",
     "interegular",
     "packaging",
-    "pillow",
+    "PIL",
     "psutil",
     "pydantic",
     "uvicorn",