diff --git a/lib/includes/nghttp2/nghttp2.h b/lib/includes/nghttp2/nghttp2.h
index 45b63b78..ae22d6e3 100644
--- a/lib/includes/nghttp2/nghttp2.h
+++ b/lib/includes/nghttp2/nghttp2.h
@@ -250,7 +250,7 @@ typedef enum {
   /**
    * The WINDOW_UPDATE frame.
    */
-  NGHTTP2_WINDOW_UPDATE = 8
+  NGHTTP2_WINDOW_UPDATE = 9
 } nghttp2_frame_type;
 
 /**
diff --git a/src/app_helper.cc b/src/app_helper.cc
index b6f85ef6..2b956e56 100644
--- a/src/app_helper.cc
+++ b/src/app_helper.cc
@@ -84,6 +84,7 @@ const char *frame_names[] = {
   "PUSH_PROMISE",
   "PING",
   "GOAWAY",
+  "UNKNOWN",
   "WINDOW_UPDATE"
 };
 } // namespace