diff --git a/configure.ac b/configure.ac
index 5668b07c7..d556a1758 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1097,6 +1097,7 @@ then
     AM_CFLAGS="$AM_CFLAGS -DWOLFSSL_DES_ECB"
     AM_CFLAGS="$AM_CFLAGS -DKEEP_OUR_CERT"
     AM_CFLAGS="$AM_CFLAGS -DKEEP_PEER_CERT"
+    AM_CFLAGS="$AM_CFLAGS -DHAVE_KEYING_MATERIAL"
 fi
 
 if test "$ENABLED_FORTRESS" = "yes"