# MutantHub mutant #4182: Arithmetic operator mutation at validation.cpp:4771
# Repository: bitcoin/bitcoin @ ddea9196493d3b8fd841a36a6c53efd85dac7a05
# File: src/validation.cpp:4771-4771
# Review: APPROVED; outcome: KILLED
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -4771,1 +4771,1 @@
-        size_t curr_coins_usage = coins.DynamicMemoryUsage() + chainstate.CoinsTip().DynamicMemoryUsage();
+        size_t curr_coins_usage = coins.DynamicMemoryUsage() - chainstate.CoinsTip().DynamicMemoryUsage();