diff --git a/configure.ac b/configure.ac
index ff9b61de20..355fb9d4d3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -4498,6 +4498,7 @@ AC_ARG_ENABLE([tlsv12],
 if test "$ENABLED_CRYPTONLY" = "yes"
 then
     ENABLED_TLSV12=no
+    AM_CFLAGS="$AM_CFLAGS -DWOLFSSL_RW_THREADED"
 fi
 if test "$ENABLED_TLSV12" = "no"
 then
@@ -6450,7 +6451,7 @@ then
 fi
 if test "$ENABLED_TLS13" = "yes"
 then
-    AM_CFLAGS="$AM_CFLAGS -DWOLFSSL_TLS13 -DHAVE_TLS_EXTENSIONS"
+    AM_CFLAGS="$AM_CFLAGS -DWOLFSSL_TLS13 -DHAVE_TLS_EXTENSIONS -DWOLFSSL_RW_THREADED"
 fi