diff --git a/deployments/attestation/opteesp/default_attestation.dts.in b/deployments/attestation/opteesp/default_attestation.dts.in
index 4f147c7..97e0006 100644
--- a/deployments/attestation/opteesp/default_attestation.dts.in
+++ b/deployments/attestation/opteesp/default_attestation.dts.in
@@ -15,7 +15,7 @@
 	exception-level = <1>; /* S-EL0 */
 	execution-state = <0>; /* AArch64 */
 	xlat-granule = <0>; /* 4KiB */
-	messaging-method = <0>; /* Direct messaging only */
+	messaging-method = <3>; /* Direct messaging only */
 	legacy-elf-format = <1>;
 
 	boot-params {
diff --git a/deployments/attestation/sp/default_attestation.dts.in b/deployments/attestation/sp/default_attestation.dts.in
index e32e2e4..ef26e0e 100644
--- a/deployments/attestation/sp/default_attestation.dts.in
+++ b/deployments/attestation/sp/default_attestation.dts.in
@@ -15,7 +15,7 @@
 	exception-level = <1>; /* S-EL0 */
 	execution-state = <0>; /* AArch64 */
 	xlat-granule = <0>; /* 4KiB */
-	messaging-method = <0>; /* Direct messaging only */
+	messaging-method = <3>; /* Direct messaging only */
 
 	boot-params {
 		compatible = "arm,ffa-manifest-boot-params";