diff --git a/tests/suites/test_suite_psa_crypto.function b/tests/suites/test_suite_psa_crypto.function
index 6c53476..b4ff66a 100644
--- a/tests/suites/test_suite_psa_crypto.function
+++ b/tests/suites/test_suite_psa_crypto.function
@@ -3481,7 +3481,8 @@
     psa_status_t status = PSA_ERROR_GENERIC_ERROR;
 #if defined(KNOWN_SUPPORTED_MAC_ALG)
     /* We need to tell the compiler that we meant to leave out the null character. */
-    const uint8_t smoke_test_key_data[16] __attribute__ ((nonstring)) = "kkkkkkkkkkkkkkkk";
+    const uint8_t smoke_test_key_data[16] MBEDTLS_ATTRIBUTE_UNTERMINATED_STRING =
+        "kkkkkkkkkkkkkkkk";
 #endif
 
     PSA_ASSERT(psa_crypto_init());
@@ -3919,7 +3920,8 @@
     psa_status_t status;
 #if defined(KNOWN_SUPPORTED_CIPHER_ALG)
     /* We need to tell the compiler that we meant to leave out the null character. */
-    const uint8_t smoke_test_key_data[16] __attribute__ ((nonstring)) = "kkkkkkkkkkkkkkkk";
+    const uint8_t smoke_test_key_data[16] MBEDTLS_ATTRIBUTE_UNTERMINATED_STRING =
+        "kkkkkkkkkkkkkkkk";
 #endif
 
     PSA_ASSERT(psa_crypto_init());
diff --git a/tests/suites/test_suite_psa_crypto_slot_management.function b/tests/suites/test_suite_psa_crypto_slot_management.function
index 4177a05..aa375a2 100644
--- a/tests/suites/test_suite_psa_crypto_slot_management.function
+++ b/tests/suites/test_suite_psa_crypto_slot_management.function
@@ -378,8 +378,8 @@
     psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
     psa_key_type_t type1 = PSA_KEY_TYPE_RAW_DATA;
     /* We need to tell the compiler that we meant to leave out the null character. */
-    const uint8_t material1[5] __attribute__ ((nonstring)) = "a key";
-    const uint8_t material2[5] __attribute__ ((nonstring)) = "b key";
+    const uint8_t material1[5] MBEDTLS_ATTRIBUTE_UNTERMINATED_STRING = "a key";
+    const uint8_t material2[5] MBEDTLS_ATTRIBUTE_UNTERMINATED_STRING = "b key";
     size_t bits1 = PSA_BYTES_TO_BITS(sizeof(material1));
     uint8_t reexported[sizeof(material1)];
     size_t reexported_length;
diff --git a/tests/suites/test_suite_ssl_decrypt.function b/tests/suites/test_suite_ssl_decrypt.function
index 46f9617..2d75a29 100644
--- a/tests/suites/test_suite_ssl_decrypt.function
+++ b/tests/suites/test_suite_ssl_decrypt.function
@@ -38,7 +38,7 @@
                               MBEDTLS_SSL_TRANSPORT_STREAM,
                               version);
     /* We need to tell the compiler that we meant to leave out the null character. */
-    const char sample_plaintext[3] __attribute__ ((nonstring)) = "ABC";
+    const char sample_plaintext[3] MBEDTLS_ATTRIBUTE_UNTERMINATED_STRING = "ABC";
     mbedtls_ssl_context ssl;
     mbedtls_ssl_init(&ssl);
     uint8_t *buf = NULL;