diff --git a/CHANGES/3233.bugfix b/CHANGES/3233.bugfix
new file mode 100644
index 00000000000..09ed35c4bb0
--- /dev/null
+++ b/CHANGES/3233.bugfix
@@ -0,0 +1 @@
+Don't uppercase HTTP method in parser
\ No newline at end of file
diff --git a/aiohttp/http_parser.py b/aiohttp/http_parser.py
index ab6d5c4f544..8b4fefcf12d 100644
--- a/aiohttp/http_parser.py
+++ b/aiohttp/http_parser.py
@@ -371,7 +371,6 @@ def parse_message(self, lines):
                 'Status line is too long', self.max_line_size, len(path))
 
         # method
-        method = method.upper()
         if not METHRE.match(method):
             raise BadStatusLine(method)