diff --git a/library/cipher.c b/library/cipher.c
index c88d666..63eaba8 100644
--- a/library/cipher.c
+++ b/library/cipher.c
@@ -1101,6 +1101,7 @@
 #if defined(MBEDTLS_GCM_C)
     if( MBEDTLS_MODE_GCM == ctx->cipher_info->mode )
         return( mbedtls_gcm_finish( (mbedtls_gcm_context *) ctx->cipher_ctx,
+                                    NULL, 0,
                                     tag, tag_len ) );
 #endif
 
@@ -1153,6 +1154,7 @@
 
         if( 0 != ( ret = mbedtls_gcm_finish(
                        (mbedtls_gcm_context *) ctx->cipher_ctx,
+                       NULL, 0,
                        check_tag, tag_len ) ) )
         {
             return( ret );