diff --git a/configure.ac b/configure.ac
index 4f326d16e8..62916b3fb7 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2718,7 +2718,7 @@ dnl **********************************************************************
 dnl Check for ngtcp2 (QUIC)
 dnl **********************************************************************
 
-OPT_TCP2="yes"
+OPT_TCP2="no"
 
 if test "x$disable_http" = "xyes"; then
   # without HTTP, ngtcp2 is no use