# MutantHub mutant #3771: Arithmetic operator mutation at pow.cpp:71
# Repository: bitcoin/bitcoin @ 4303f3b7f0775cdbbe77faddf142e1e44fa590ca
# File: src/pow.cpp:71-71
# Review: APPROVED; outcome: SURVIVED
--- a/src/pow.cpp
+++ b/src/pow.cpp
@@ -71,1 +71,1 @@
-        int nHeightFirst = pindexLast->nHeight - (params.DifficultyAdjustmentInterval()-1);
+        int nHeightFirst = pindexLast->nHeight + (params.DifficultyAdjustmentInterval()-1);