diff --git a/target/linux/rockchip/Makefile b/target/linux/rockchip/Makefile
index c0877d7a9..31816492e 100644
--- a/target/linux/rockchip/Makefile
+++ b/target/linux/rockchip/Makefile
@@ -7,7 +7,7 @@ BOARDNAME:=Rockchip
 FEATURES:=ext4 audio usb usbgadget display gpio fpu pci pcie rootfs-part boot-part squashfs
 SUBTARGETS:=armv8
 
-KERNEL_PATCHVER=5.15
+KERNEL_PATCHVER:=5.15
 KERNEL_TESTING_PATCHVER:=6.0
 
 define Target/Description