diff --git a/sys/amd64/conf/XENHVM b/sys/amd64/conf/XENHVM
index d9482e50a6ab..e5fc0496f92a 100644
--- a/sys/amd64/conf/XENHVM
+++ b/sys/amd64/conf/XENHVM
@@ -17,6 +17,7 @@ makeoptions	MODULES_OVERRIDE=""
 #
 options 	NO_ADAPTIVE_MUTEXES
 options 	NO_ADAPTIVE_RWLOCKS
+options 	NO_ADAPTIVE_SX
 
 # Xen HVM support
 options 	XENHVM