# MutantHub mutant #3915: Arithmetic operator mutation at validation.cpp:159
# Repository: bitcoin/bitcoin @ ddea9196493d3b8fd841a36a6c53efd85dac7a05
# File: src/validation.cpp:159-159
# Review: APPROVED; outcome: KILLED
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -159,1 +159,1 @@
-    const int nBlockHeight = active_chain_tip.nHeight + 1;
+    const int nBlockHeight = active_chain_tip.nHeight - 1;