diff --git a/src/shrpx_downstream.cc b/src/shrpx_downstream.cc
index 6b7f4a0e..1fc8f854 100644
--- a/src/shrpx_downstream.cc
+++ b/src/shrpx_downstream.cc
@@ -928,13 +928,13 @@ void Downstream::inspect_http1_request() {
   if (!upgrade_request_) {
     auto idx = request_hdidx_[http2::HD_UPGRADE];
     if (idx != -1) {
-      upgrade_request_ = true;
-
       auto &val = request_headers_[idx].value;
       // TODO Perform more strict checking for upgrade headers
       if (util::streq_l(NGHTTP2_CLEARTEXT_PROTO_VERSION_ID, val.c_str(),
                         val.size())) {
         http2_upgrade_seen_ = true;
+      } else {
+        upgrade_request_ = true;
       }
     }
   }
diff --git a/src/shrpx_downstream.h b/src/shrpx_downstream.h
index 2bd29312..9cd12ad0 100644
--- a/src/shrpx_downstream.h
+++ b/src/shrpx_downstream.h
@@ -80,10 +80,11 @@ public:
   bool request_buf_full();
   // Returns true if upgrade (HTTP Upgrade or CONNECT) is succeeded.
   void check_upgrade_fulfilled();
-  // Returns true if the request is upgrade.
+  // Returns true if the request is upgrade.  Upgrade to HTTP/2 is
+  // excluded.  For HTTP/2 Upgrade, check get_http2_upgrade_request().
   bool get_upgrade_request() const;
   // Returns true if the upgrade is succeded as a result of the call
-  // check_upgrade_fulfilled().
+  // check_upgrade_fulfilled().  HTTP/2 Upgrade is excluded.
   bool get_upgraded() const;
   // Inspects HTTP/2 request.
   void inspect_http2_request();