diff --git a/configure.ac b/configure.ac
index d89927f5d..831790136 100644
--- a/configure.ac
+++ b/configure.ac
@@ -6988,6 +6988,7 @@ then
     AM_CFLAGS="$AM_CFLAGS -DKEEP_PEER_CERT"
     AM_CFLAGS="$AM_CFLAGS -DWOLFSSL_ALWAYS_VERIFY_CB"
     AM_CFLAGS="$AM_CFLAGS -DWOLFSSL_ALWAYS_KEEP_SNI"
+    AM_CFLAGS="$AM_CFLAGS -DWOLFSSL_TLS13_MIDDLEBOX_COMPAT"
 
     # Enable prereqs if not already enabled
     if test "x$ENABLED_DTLS" = "xno"