# MutantHub mutant #4104: Arithmetic operator mutation at validation.cpp:4165
# Repository: bitcoin/bitcoin @ ddea9196493d3b8fd841a36a6c53efd85dac7a05
# File: src/validation.cpp:4165-4165
# Review: APPROVED; outcome: SURVIVED
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -4165,1 +4165,1 @@
-    const int nHeight = pindexPrev->nHeight + 1;
+    const int nHeight = pindexPrev->nHeight - 1;