--- a/configure.ac
+++ b/configure.ac
@@ -943,6 +943,7 @@ then
     AM_CFLAGS="$AM_CFLAGS -DWOLFSSL_ALWAYS_KEEP_SNI"
     AM_CFLAGS="$AM_CFLAGS -DHAVE_EX_DATA"
     AM_CFLAGS="$AM_CFLAGS -DHAVE_EXT_CACHE"
+    AM_CFLAGS="$AM_CFLAGS -DHAVE_SECRET_CALLBACK"
     AM_CFLAGS="$AM_CFLAGS -DWOLFSSL_EITHER_SIDE"
     AM_CFLAGS="$AM_CFLAGS -DOPENSSL_EXTRA_X509_SMALL"