diff --git a/tests/extended_type.cc b/tests/extended_type.cc
index aaf7e339de..b56bc07fa2 100644
--- a/tests/extended_type.cc
+++ b/tests/extended_type.cc
@@ -47,8 +47,8 @@ TEST_CASE("make extended type") {
   heif_image_handle *output_image_handle;
 
   err = heif_context_encode_image(ctx, input_image, encoder, nullptr, &output_image_handle);
-  if (err.message) { INFO("error message: " << err.message); }
-  REQUIRE(err.code == heif_error_Ok);
+  INFO("error message: " << err.message);
+  REQUIRE(err.code+1 == heif_error_Ok);
 
   heif_item_id itemId;
   err = heif_context_get_primary_image_ID(ctx, &itemId);