# MutantHub mutant #281: Arithmetic operator mutation at pow.cpp:42
# Repository: bitcoin/bitcoin @ a09a81ebfce360a45484e2d0e4e8e889f5d5d214
# File: src/pow.cpp:42-42
# Review: APPROVED; outcome: SURVIVED
--- a/src/pow.cpp
+++ b/src/pow.cpp
@@ -42,1 +42,1 @@
-    int nHeightFirst = pindexLast->nHeight - (params.DifficultyAdjustmentInterval()-1);
+    int nHeightFirst = pindexLast->nHeight + (params.DifficultyAdjustmentInterval()-1);