diff --git a/library/psa_crypto_aead.c b/library/psa_crypto_aead.c
index 01d5d19..9000abf 100644
--- a/library/psa_crypto_aead.c
+++ b/library/psa_crypto_aead.c
@@ -643,7 +643,7 @@
 
         status =  mbedtls_to_psa_error(
             mbedtls_gcm_finish( &operation->ctx.gcm,
-                                ciphertext, ciphertext_size,
+                                ciphertext, ciphertext_size, ciphertext_length,
                                 tag, operation->tag_length ) );
     }
     else