1 files changed, 1 insertions, 1 deletions
diff --git a/src/init.cpp b/src/init.cpp
index 67b3370e63..1b5507703c 100644
--- a/src/init.cpp
+++ b/src/init.cpp
@@ -632,7 +632,7 @@ static void CleanupBlockRevFiles()
     // keeping a separate counter.  Once we hit a gap (or if 0 doesn't exist)
     // start removing block files.
     int nContigCounter = 0;
-    for (const std::pair<std::string, fs::path>& item : mapBlockFiles) {
+    for (const std::pair<const std::string, fs::path>& item : mapBlockFiles) {
         if (atoi(item.first) == nContigCounter) {
             nContigCounter++;
             continue;