diff --git a/TESTS/psa/spm_client/COMPONENT_SPE/psa_setup.c b/TESTS/psa/spm_client/COMPONENT_SPE/psa_setup.c
index b84e6d64c0..60e45e4208 100644
--- a/TESTS/psa/spm_client/COMPONENT_SPE/psa_setup.c
+++ b/TESTS/psa/spm_client/COMPONENT_SPE/psa_setup.c
@@ -33,6 +33,7 @@
 #include "psa_its_partition.h"
 
 extern const uint32_t crypto_srv_external_sids[4];
+extern const uint32_t platform_external_sids[1];
 
 spm_partition_t g_partitions[4] = {
     {
@@ -64,7 +65,7 @@ spm_partition_t g_partitions[4] = {
         .flags_interrupts = 0,
         .rot_services = NULL,
         .rot_services_count = PLATFORM_ROT_SRV_COUNT,
-        .extern_sids = NULL,
+        .extern_sids = platform_external_sids,
         .extern_sids_count = PLATFORM_EXT_ROT_SRV_COUNT,
         .irq_mapper = NULL,
     },
diff --git a/TESTS/psa/spm_server/COMPONENT_SPE/psa_setup.c b/TESTS/psa/spm_server/COMPONENT_SPE/psa_setup.c
index 3a284af0e5..b7c7b78f86 100644
--- a/TESTS/psa/spm_server/COMPONENT_SPE/psa_setup.c
+++ b/TESTS/psa/spm_server/COMPONENT_SPE/psa_setup.c
@@ -35,6 +35,7 @@
 
 extern const uint32_t server_test_part1_external_sids[2];
 extern const uint32_t crypto_srv_external_sids[4];
+extern const uint32_t platform_external_sids[1];
 
 spm_partition_t g_partitions[5] = {
     {
@@ -77,7 +78,7 @@ spm_partition_t g_partitions[5] = {
         .flags_interrupts = 0,
         .rot_services = NULL,
         .rot_services_count = PLATFORM_ROT_SRV_COUNT,
-        .extern_sids = NULL,
+        .extern_sids = platform_external_sids,
         .extern_sids_count = PLATFORM_EXT_ROT_SRV_COUNT,
         .irq_mapper = NULL,
     },
diff --git a/TESTS/psa/spm_smoke/COMPONENT_SPE/psa_setup.c b/TESTS/psa/spm_smoke/COMPONENT_SPE/psa_setup.c
index 1dfe9bc93c..116eb77a9c 100644
--- a/TESTS/psa/spm_smoke/COMPONENT_SPE/psa_setup.c
+++ b/TESTS/psa/spm_smoke/COMPONENT_SPE/psa_setup.c
@@ -33,6 +33,7 @@
 #include "psa_its_partition.h"
 
 extern const uint32_t crypto_srv_external_sids[4];
+extern const uint32_t platform_external_sids[1];
 
 spm_partition_t g_partitions[4] = {
     {
@@ -64,7 +65,7 @@ spm_partition_t g_partitions[4] = {
         .flags_interrupts = 0,
         .rot_services = NULL,
         .rot_services_count = PLATFORM_ROT_SRV_COUNT,
-        .extern_sids = NULL,
+        .extern_sids = platform_external_sids,
         .extern_sids_count = PLATFORM_EXT_ROT_SRV_COUNT,
         .irq_mapper = NULL,
     },
diff --git a/components/TARGET_PSA/TARGET_MBED_SPM/COMPONENT_SPE/psa_setup.c b/components/TARGET_PSA/TARGET_MBED_SPM/COMPONENT_SPE/psa_setup.c
index 71c8a99b56..b42b30f7c3 100644
--- a/components/TARGET_PSA/TARGET_MBED_SPM/COMPONENT_SPE/psa_setup.c
+++ b/components/TARGET_PSA/TARGET_MBED_SPM/COMPONENT_SPE/psa_setup.c
@@ -32,6 +32,7 @@
 #include "psa_its_partition.h"
 
 extern const uint32_t crypto_srv_external_sids[4];
+extern const uint32_t platform_external_sids[1];
 
 __attribute__((weak))
 spm_partition_t g_partitions[3] = {
@@ -53,7 +54,7 @@ spm_partition_t g_partitions[3] = {
         .flags_interrupts = 0,
         .rot_services = NULL,
         .rot_services_count = PLATFORM_ROT_SRV_COUNT,
-        .extern_sids = NULL,
+        .extern_sids = platform_external_sids,
         .extern_sids_count = PLATFORM_EXT_ROT_SRV_COUNT,
         .irq_mapper = NULL,
     },
diff --git a/components/TARGET_PSA/services/platform/COMPONENT_SPE/TARGET_MBED_SPM/psa_platform_partition.c b/components/TARGET_PSA/services/platform/COMPONENT_SPE/TARGET_MBED_SPM/psa_platform_partition.c
index e5082e1f68..7d761e8876 100644
--- a/components/TARGET_PSA/services/platform/COMPONENT_SPE/TARGET_MBED_SPM/psa_platform_partition.c
+++ b/components/TARGET_PSA/services/platform/COMPONENT_SPE/TARGET_MBED_SPM/psa_platform_partition.c
@@ -30,6 +30,7 @@
 #include "spm_internal.h"
 #include "psa_platform_partition.h"
 #include "psa_platform_ifs.h"
+#include "psa_its_ifs.h"
 
 
 /* Threads stacks */
@@ -78,6 +79,10 @@ spm_rot_service_t platform_rot_services[PLATFORM_ROT_SRV_COUNT] = {
     },
 };
 
+/* External SIDs used by PLATFORM */
+const uint32_t platform_external_sids[1] = {
+    PSA_ITS_RESET,
+};
 
 static osRtxMutex_t platform_mutex = {0};
 static const osMutexAttr_t platform_mutex_attr = {
diff --git a/components/TARGET_PSA/services/platform/COMPONENT_SPE/psa_platform_partition.h b/components/TARGET_PSA/services/platform/COMPONENT_SPE/psa_platform_partition.h
index 3106b9c535..ef2f266d4a 100644
--- a/components/TARGET_PSA/services/platform/COMPONENT_SPE/psa_platform_partition.h
+++ b/components/TARGET_PSA/services/platform/COMPONENT_SPE/psa_platform_partition.h
@@ -29,7 +29,7 @@
 #define PLATFORM_ID 8
 
 #define PLATFORM_ROT_SRV_COUNT (2UL)
-#define PLATFORM_EXT_ROT_SRV_COUNT (0UL)
+#define PLATFORM_EXT_ROT_SRV_COUNT (1UL)
 
 /* PLATFORM event flags */
 #define PLATFORM_RESERVED1_POS (1UL)
diff --git a/components/TARGET_PSA/services/platform/platform_psa.json b/components/TARGET_PSA/services/platform/platform_psa.json
index ab5c590ee3..a05f869703 100644
--- a/components/TARGET_PSA/services/platform/platform_psa.json
+++ b/components/TARGET_PSA/services/platform/platform_psa.json
@@ -23,6 +23,9 @@
         "minor_policy": "RELAXED"
       }
     ],
+    "extern_sids": [
+      "PSA_ITS_RESET"
+    ],
     "source_files": [
       "COMPONENT_SPE/platform_partition.c"
     ]