diff --git a/deployments/attestation/config/default-opteesp/default_attestation.dts.in b/deployments/attestation/config/default-opteesp/default_attestation.dts.in
index 287942d..3a2ac76 100644
--- a/deployments/attestation/config/default-opteesp/default_attestation.dts.in
+++ b/deployments/attestation/config/default-opteesp/default_attestation.dts.in
@@ -16,6 +16,7 @@
 	execution-state = <0>; /* AArch64 */
 	xlat-granule = <0>; /* 4KiB */
 	messaging-method = <3>; /* Direct messaging only */
+	ns-interrupts-action = <2>; /* Non-secure interrupts are signaled */
 	elf-format = <1>;
 
 	boot-params {