# MutantHub mutant #3845: Arithmetic operator mutation at blockstorage.cpp:816
# Repository: bitcoin/bitcoin @ 4fe28722a572793da7614734a0c9cc8e1adc751a
# File: src/node/blockstorage.cpp:816-816
# Review: APPROVED; outcome: SURVIVED
--- a/src/node/blockstorage.cpp
+++ b/src/node/blockstorage.cpp
@@ -816,1 +816,1 @@
-        retval += file.nSize + file.nUndoSize;
+        retval += file.nSize - file.nUndoSize;