# MutantHub mutant #4378: Arithmetic operator mutation at validation.cpp:6367
# Repository: bitcoin/bitcoin @ ddea9196493d3b8fd841a36a6c53efd85dac7a05
# File: src/validation.cpp:6367-6367
# Review: APPROVED; outcome: SURVIVED
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -6367,1 +6367,1 @@
-        return best_header->nHeight - tip->nHeight;
+        return best_header->nHeight + tip->nHeight;