diff --git a/vllm/envs.py b/vllm/envs.py
index d54de9da2531..0115e16dbb13 100644
--- a/vllm/envs.py
+++ b/vllm/envs.py
@@ -295,7 +295,7 @@ def maybe_convert_int(value: Optional[str]) -> Optional[int]:
 
     # 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":