# MutantHub mutant #278: Logical operator mutation at pow.cpp:33
# Repository: bitcoin/bitcoin @ a09a81ebfce360a45484e2d0e4e8e889f5d5d214
# File: src/pow.cpp:33-33
# Review: APPROVED; outcome: SURVIVED
--- a/src/pow.cpp
+++ b/src/pow.cpp
@@ -33,1 +33,1 @@
-                while (pindex->pprev && pindex->nHeight % params.DifficultyAdjustmentInterval() != 0 && pindex->nBits == nProofOfWorkLimit)
+                while (pindex->pprev || pindex->nHeight % params.DifficultyAdjustmentInterval() != 0 && pindex->nBits == nProofOfWorkLimit)