diff --git a/plat/ti/k3/common/drivers/sec_proxy/sec_proxy.c b/plat/ti/k3/common/drivers/sec_proxy/sec_proxy.c
index 1bed229..fb27336 100644
--- a/plat/ti/k3/common/drivers/sec_proxy/sec_proxy.c
+++ b/plat/ti/k3/common/drivers/sec_proxy/sec_proxy.c
@@ -320,7 +320,7 @@
 
 		i = msg->len - trail_bytes;
 		while (trail_bytes--) {
-			msg->buf[i] = data_trail & 0xff;
+			msg->buf[i++] = data_trail & 0xff;
 			data_trail >>= 8;
 		}
 	}