diff --git a/tests/include/test/drivers/key_management.h b/tests/include/test/drivers/key_management.h
index 3cde1aa..ed0b5eb 100644
--- a/tests/include/test/drivers/key_management.h
+++ b/tests/include/test/drivers/key_management.h
@@ -113,5 +113,14 @@
     psa_key_attributes_t *attributes,
     uint8_t *key_buffer, size_t key_buffer_size, size_t *key_buffer_length );
 
+psa_status_t mbedtls_test_opaque_copy_key(
+    psa_key_attributes_t *attributes,
+    const uint8_t *source_key,
+    size_t source_key_size,
+    uint8_t *target_key_buffer,
+    size_t target_buffer_size,
+    size_t *key_length );
+
+
 #endif /* PSA_CRYPTO_DRIVER_TEST */
 #endif /* PSA_CRYPTO_TEST_DRIVERS_KEY_MANAGEMENT_H */