diff --git a/tests/suites/test_suite_psa_crypto.function b/tests/suites/test_suite_psa_crypto.function
index a240df7..2feadf8 100644
--- a/tests/suites/test_suite_psa_crypto.function
+++ b/tests/suites/test_suite_psa_crypto.function
@@ -4060,6 +4060,7 @@
     psa_destroy_key( key );
     mbedtls_free( ciphertext );
     mbedtls_free( finish_ciphertext );
+    mbedtls_free( tag_buffer );
     psa_aead_abort( &operation );
     PSA_DONE( );
 }