diff --git a/tests/suites/test_suite_psa_crypto.function b/tests/suites/test_suite_psa_crypto.function
index 8a08b1c520..a66ad7587f 100644
--- a/tests/suites/test_suite_psa_crypto.function
+++ b/tests/suites/test_suite_psa_crypto.function
@@ -506,7 +506,7 @@ static int aead_multipart_internal_func( int key_type_arg, data_t *key_data,
 
             if( output_data && output_part_length )
             {
-                memcpy( ( output_data + part_offset ), part_data,
+                memcpy( ( output_data + output_length ), part_data,
                         output_part_length );
             }