diff --git a/buildroot-external/rootfs-overlay/etc/sysctl.d/30-cp15barrier.conf b/buildroot-external/rootfs-overlay/etc/sysctl.d/30-cp15barrier.conf
index cccbe84d5..531221123 100644
--- a/buildroot-external/rootfs-overlay/etc/sysctl.d/30-cp15barrier.conf
+++ b/buildroot-external/rootfs-overlay/etc/sysctl.d/30-cp15barrier.conf
@@ -1,3 +1,3 @@
 # disable "deprecated CP15 Barrier instruction" warnings
 # https://www.kernel.org/doc/Documentation/arm64/legacy_instructions.txt
-abi.cp15_barrier = 2
+-abi.cp15_barrier = 2