diff --git a/vllm/envs.py b/vllm/envs.py
index 6b14b331fc90b..a5802035d8020 100644
--- a/vllm/envs.py
+++ b/vllm/envs.py
@@ -294,7 +294,7 @@ environment_variables: dict[str, Callable[[], Any]] = {
 
     # this is used for configuring the default logging level
     "VLLM_LOGGING_LEVEL":
-    lambda: os.getenv("VLLM_LOGGING_LEVEL", "INFO"),
+    lambda: os.getenv("VLLM_LOGGING_LEVEL", "INFO").upper(),
 
     # if set, VLLM_LOGGING_PREFIX will be prepended to all log messages
     "VLLM_LOGGING_PREFIX":