diff --git a/sys/conf/kern.post.mk b/sys/conf/kern.post.mk
index d3b398e87b5c..a82d904227fc 100644
--- a/sys/conf/kern.post.mk
+++ b/sys/conf/kern.post.mk
@@ -86,7 +86,8 @@ ports-${__target}:
 
 .ORDER: kernel-install modules-install
 
-kernel-all: ${KERNEL_KO} ${KERNEL_EXTRA}
+beforebuild: .PHONY
+kernel-all: beforebuild .WAIT ${KERNEL_KO} ${KERNEL_EXTRA}
 
 kernel-cleandir: kernel-clean kernel-cleandepend