diff --git a/host/xtest/Makefile b/host/xtest/Makefile
index af45f5e..36c7e3d 100644
--- a/host/xtest/Makefile
+++ b/host/xtest/Makefile
@@ -137,6 +137,8 @@
 CFLAGS += -I../../ta/large/include
 CFLAGS += -I../../ta/supp_plugin/include
 CFLAGS += -I../../ta/bti_test/include
+CFLAGS += -I../../ta/subkey1/include
+CFLAGS += -I../../ta/subkey2/include
 
 TA_DIR ?= /lib/optee_armtz
 CFLAGS += -DTA_DIR=\"$(TA_DIR)\"
diff --git a/host/xtest/regression_1000.c b/host/xtest/regression_1000.c
index a14a6ba..41b714f 100644
--- a/host/xtest/regression_1000.c
+++ b/host/xtest/regression_1000.c
@@ -3196,3 +3196,28 @@
 }
 ADBG_CASE_DEFINE(regression, 1038, xtest_tee_test_1038,
 		 "Test MTE (Memory Tag Extension)");
+
+static void xtest_tee_test_1039(ADBG_Case_t *c)
+{
+	TEEC_Session session = { };
+	uint32_t ret_orig = 0;
+
+	Do_ADBG_BeginSubCase(c, "Load TA with two levels of subkeys");
+	if (ADBG_EXPECT_TEEC_SUCCESS(c,
+			xtest_teec_open_session(&session, &subkey1_ta_uuid,
+						NULL, &ret_orig)))
+		TEEC_CloseSession(&session);
+	Do_ADBG_EndSubCase(c, "Load TA with two levels of subkeys");
+
+	Do_ADBG_BeginSubCase(c, "Load TA with identity subkey");
+	if (ADBG_EXPECT_TEEC_SUCCESS(c,
+			xtest_teec_open_session(&session, &subkey2_ta_uuid,
+						NULL, &ret_orig)))
+		TEEC_CloseSession(&session);
+	Do_ADBG_EndSubCase(c, "Load TA with identity subkey");
+
+}
+
+
+ADBG_CASE_DEFINE(regression, 1039, xtest_tee_test_1039,
+		 "Test subkey verification");
diff --git a/host/xtest/xtest_test.c b/host/xtest/xtest_test.c
index b07599c..7beecff 100644
--- a/host/xtest/xtest_test.c
+++ b/host/xtest/xtest_test.c
@@ -23,6 +23,8 @@
 #include <ta_supp_plugin.h>
 #include <ta_tpm_log_test.h>
 #include <ta_arm_bti.h>
+#include <ta_subkey1.h>
+#include <ta_subkey2.h>
 #include <tee_api_defines.h>
 #include <tee_client_api.h>
 #include <__tee_isocket_defines.h>
@@ -202,3 +204,5 @@
 const TEEC_UUID supp_plugin_test_ta_uuid = TA_SUPP_PLUGIN_UUID;
 const TEEC_UUID large_ta_uuid = TA_LARGE_UUID;
 const TEEC_UUID bti_test_ta_uuid = TA_BTI_UUID;
+const TEEC_UUID subkey1_ta_uuid = TA_SUBKEY1_UUID;
+const TEEC_UUID subkey2_ta_uuid = TA_SUBKEY2_UUID;
diff --git a/host/xtest/xtest_test.h b/host/xtest/xtest_test.h
index 215024b..50fc2b5 100644
--- a/host/xtest/xtest_test.h
+++ b/host/xtest/xtest_test.h
@@ -139,6 +139,8 @@
 extern const TEEC_UUID supp_plugin_test_ta_uuid;
 extern const TEEC_UUID large_ta_uuid;
 extern const TEEC_UUID bti_test_ta_uuid;
+extern const TEEC_UUID subkey1_ta_uuid;
+extern const TEEC_UUID subkey2_ta_uuid;
 extern char *xtest_tee_name;
 
 #endif /*XTEST_TEST_H*/