diff --git a/gunicorn-logging-extension/src/gunicorn_logging_extension/__init__.py b/gunicorn-logging-extension/src/gunicorn_logging_extension/__init__.py
index 140619c..7cfc1a1 100644
--- a/gunicorn-logging-extension/src/gunicorn_logging_extension/__init__.py
+++ b/gunicorn-logging-extension/src/gunicorn_logging_extension/__init__.py
@@ -88,7 +88,7 @@ class Logger(gLogger):
             METHOD=environ.get("REQUEST_METHOD"),
             PATH=environ.get("PATH_INFO"),
             QUERY=environ.get("QUERY_STRING"),
-            PROTO=environ.get("SERVER_PROTOCOL"),
+            PROTOCOL=environ.get("SERVER_PROTOCOL"),
             TIME="%d.%06d" % (request_time.seconds, request_time.microseconds),
         )
         if environ.get("REMOTE_ADDR", False):