# MutantHub mutant #4022: Constant replacement mutation at validation.cpp:2153
# Repository: bitcoin/bitcoin @ ddea9196493d3b8fd841a36a6c53efd85dac7a05
# File: src/validation.cpp:2153-2153
# Review: APPROVED; outcome: SURVIVED
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -2153,1 +2153,1 @@
-            undo.fCoinBase = alternate.fCoinBase;
+            undo.fCoinBase = true;