diff --git a/target/linux/ipq806x/base-files/lib/upgrade/platform.sh b/target/linux/ipq806x/base-files/lib/upgrade/platform.sh
index 5ec4f513bd3..e292e231c89 100644
--- a/target/linux/ipq806x/base-files/lib/upgrade/platform.sh
+++ b/target/linux/ipq806x/base-files/lib/upgrade/platform.sh
@@ -81,7 +81,7 @@ platform_do_upgrade() {
 }
 
 platform_copy_config() {
-	case "${board_name}" in
+	case "$(board_name)" in
 	asus,onhub |\
 	tplink,onhub)
 		emmc_copy_config