diff --git a/tmp/post_upgrade_command b/tmp/post_upgrade_command
index 634afb00c3a..9e3dc2d69a9 100755
--- a/tmp/post_upgrade_command
+++ b/tmp/post_upgrade_command
@@ -30,7 +30,11 @@ case "$OLDKERNEL" in
 	KERNELTYPE=SMP
 	;;
 	*)
-	KERNELTYPE=SMP
+	if [ "${PFSENSETYPE}" = "pfSense" ]; then
+		KERNELTYPE=SMP
+	elif [ "${PFSENSETYPE}" = "nanobsd" ]; then
+		KERNELTYPE=WRAP
+	fi
 	;;
 esac