diff --git a/config-post.h b/config-post.h
index 05672121f0..24117bbbd4 100644
--- a/config-post.h
+++ b/config-post.h
@@ -44,6 +44,8 @@
 # undef WITH_SSH2
 # undef WITH_SYSTEMD_DAEMON
 # undef WITH_VIRTUALPORT
+# undef WITH_YAJL
+# undef WITH_YAJL2
 #endif
 
 /*