diff --git a/libmproxy/protocol2/http.py b/libmproxy/protocol2/http.py
index e227f0ba4..e5a434f23 100644
--- a/libmproxy/protocol2/http.py
+++ b/libmproxy/protocol2/http.py
@@ -469,7 +469,7 @@ class HttpLayer(Layer):
 
     def validate_request(self, request):
         if request.form_in == "absolute" and request.scheme != "http":
-            self.send_resplonse(make_error_response(400, "Invalid request scheme: %s" % request.scheme))
+            self.send_response(make_error_response(400, "Invalid request scheme: %s" % request.scheme))
             raise HttpException("Invalid request scheme: %s" % request.scheme)
 
         expected_request_forms = {