diff --git a/share/mk/bsd.kmod.mk b/share/mk/bsd.kmod.mk
index 586369f97dd..7ccf1312b49 100644
--- a/share/mk/bsd.kmod.mk
+++ b/share/mk/bsd.kmod.mk
@@ -2,7 +2,7 @@
 
 # Search for kernel source tree in standard places.
 .for _dir in ${.CURDIR}/../.. ${.CURDIR}/../../.. ${.CURDIR}/../../../.. /sys /usr/src/sys
-.if !defined(SYSDIR) && exists(${_dir}/conf/kmod.mk)
+.if !defined(SYSDIR) && exists(${_dir}/kern) && exists(${_dir}/conf/kmod.mk)
 SYSDIR=	${_dir}
 .endif
 .endfor