diff --git a/include/common/firmware_image_package.h b/include/common/firmware_image_package.h
index f168f23..aba5b57 100644
--- a/include/common/firmware_image_package.h
+++ b/include/common/firmware_image_package.h
@@ -15,13 +15,13 @@
 
 /* ToC Entry UUIDs */
 #define UUID_FIRMWARE_UPDATE_SCP_BL2U \
-	{0x03279265, 0x742f, 0x44e6, 0x8d, 0xff, {0x57, 0x9a, 0xc1, 0xff, 0x06, 0x10} }
+	{{0x65, 0x92, 0x27, 0x03}, {0x2f, 0x74}, {0xe6, 0x44}, 0x8d, 0xff, {0x57, 0x9a, 0xc1, 0xff, 0x06, 0x10} }
 #define UUID_FIRMWARE_UPDATE_BL2U \
-	{0x37ebb360, 0xe5c1, 0x41ea, 0x9d, 0xf3, {0x19, 0xed, 0xa1, 0x1f, 0x68, 0x01} }
+	{{0x60, 0xb3, 0xeb, 0x37}, {0xc1, 0xe5}, {0xea, 0x41}, 0x9d, 0xf3, {0x19, 0xed, 0xa1, 0x1f, 0x68, 0x01} }
 #define UUID_FIRMWARE_UPDATE_NS_BL2U \
-	{0x111d514f, 0xe52b, 0x494e, 0xb4, 0xc5, {0x83, 0xc2, 0xf7, 0x15, 0x84, 0x0a} }
+	{{0x4f, 0x51, 0x1d, 0x11}, {0x2b, 0xe5}, {0x4e, 0x49}, 0xb4, 0xc5, {0x83, 0xc2, 0xf7, 0x15, 0x84, 0x0a} }
 #define UUID_FIRMWARE_UPDATE_FWU_CERT \
-	{0xb28a4071, 0xd618, 0x4c87, 0x8b, 0x2e, {0xc6, 0xdc, 0xcd, 0x50, 0xf0, 0x96} }
+	{{0x71, 0x40, 0x8a, 0xb2}, {0x18, 0xd6}, {0x87, 0x4c}, 0x8b, 0x2e, {0xc6, 0xdc, 0xcd, 0x50, 0xf0, 0x96} }
 
 typedef struct fip_toc_header {
 	uint32_t	name;
diff --git a/include/lib/libc/uuid.h b/include/lib/libc/uuid.h
index bdefb91..3a1699b 100644
--- a/include/lib/libc/uuid.h
+++ b/include/lib/libc/uuid.h
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2002 Marcel Moolenaar
  * All rights reserved.
  *
@@ -27,7 +29,7 @@
  */
 
 /*
- * Portions copyright (c) 2014, ARM Limited and Contributors.
+ * Portions copyright (c) 2014-2020, ARM Limited and Contributors.
  * All rights reserved.
  */
 
@@ -40,17 +42,10 @@
 /* Length of a node address (an IEEE 802 address). */
 #define	_UUID_NODE_LEN		6
 
-/*
- * See also:
- *      http://www.opengroup.org/dce/info/draft-leach-uuids-guids-01.txt
- *      http://www.opengroup.org/onlinepubs/009629399/apdxa.htm
- *
- * A DCE 1.1 compatible source representation of UUIDs.
- */
 struct uuid {
-	uint32_t	time_low;
-	uint16_t	time_mid;
-	uint16_t	time_hi_and_version;
+	uint8_t		time_low[4];
+	uint8_t		time_mid[2];
+	uint8_t		time_hi_and_version[2];
 	uint8_t		clock_seq_hi_and_reserved;
 	uint8_t		clock_seq_low;
 	uint8_t		node[_UUID_NODE_LEN];
diff --git a/include/runtime_services/secure_el1_payloads/tsp.h b/include/runtime_services/secure_el1_payloads/tsp.h
index 6a4a3d6..87ee6f7 100644
--- a/include/runtime_services/secure_el1_payloads/tsp.h
+++ b/include/runtime_services/secure_el1_payloads/tsp.h
@@ -16,8 +16,11 @@
 #include <uuid.h>
 
 static const uuid_t tsp_uuid = {
-	0x5b3056a0, 0x3291, 0x427b, 0x98, 0x11,
-	{ 0x71, 0x68, 0xca, 0x50, 0xf3, 0xfa }
+	{0xa0, 0x56, 0x30, 0x5b},
+	{0x91, 0x32},
+	{0x7b, 0x42},
+	0x98, 0x11,
+	{0x71, 0x68, 0xca, 0x50, 0xf3, 0xfa}
 };
 
 /*
diff --git a/lib/utils/uuid.c b/lib/utils/uuid.c
index 2c79dfb..52af1e7 100644
--- a/lib/utils/uuid.c
+++ b/lib/utils/uuid.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2018-2019, Arm Limited. All rights reserved.
+ * Copyright (c) 2018-2020, Arm Limited. All rights reserved.
  *
  * SPDX-License-Identifier: BSD-3-Clause
  */
@@ -10,9 +10,9 @@
 #include <uuid_utils.h>
 
 /* Format string to print a UUID */
-static const char *uuid_str_fmt = "{ 0x%08x, 0x%04x, 0x%04x, 0x%02x, 0x%02x, "
-	"0x%02x, 0x%02x, 0x%02x, 0x%02x, 0x%02x, 0x%02x }";
-
+static const char *uuid_str_fmt = "{ 0x%02x, 0x%02x, 0x%02x, 0x%02x, 0x%02x, "
+	"0x%02x, 0x%02x, 0x%02x, 0x%02x, 0x%02x, 0x%02x, 0x%02x, 0x%02x, 0x%02x, "
+	"0x%02x, 0x%02x }";
 
 unsigned int is_uuid_null(const uuid_t *uuid)
 {
@@ -27,7 +27,10 @@
 	assert(str != NULL);
 
 	snprintf(str, UUID_STR_SIZE, uuid_str_fmt,
-		 uuid->time_low, uuid->time_mid, uuid->time_hi_and_version,
+		 uuid->time_low[0], uuid->time_low[1],
+		 uuid->time_low[2], uuid->time_low[3],
+		 uuid->time_mid[0], uuid->time_mid[1],
+		 uuid->time_hi_and_version[0], uuid->time_hi_and_version[1],
 		 uuid->clock_seq_hi_and_reserved, uuid->clock_seq_low,
 		 uuid->node[0], uuid->node[1], uuid->node[2], uuid->node[3],
 		 uuid->node[4], uuid->node[5]);
diff --git a/tftf/tests/runtime_services/standard_service/query_std_svc.c b/tftf/tests/runtime_services/standard_service/query_std_svc.c
index 34141d2..c8ce6e9 100644
--- a/tftf/tests/runtime_services/standard_service/query_std_svc.c
+++ b/tftf/tests/runtime_services/standard_service/query_std_svc.c
@@ -15,8 +15,11 @@
  * Firmware.
  */
 static const uuid_t armtf_std_svc_uuid = {
-	0x108d905b, 0xf863, 0x47e8, 0xae, 0x2d,
-	{ 0xc0, 0xfb, 0x56, 0x41, 0xf6, 0xe2 }
+	{0x5b, 0x90, 0x8d, 0x10},
+	{0x63, 0xf8},
+	{0xe8, 0x47},
+	0xae, 0x2d,
+	{0xc0, 0xfb, 0x56, 0x41, 0xf6, 0xe2}
 };
 
 /**