diff --git a/src/main.cpp b/src/main.cpp
index e01cba61f..a8f333aa8 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -147,7 +147,7 @@ namespace {
 
     struct CBlockIndexWorkComparator
     {
-        bool operator()(const CBlockIndex *pa, const CBlockIndex *pb) const {
+        bool operator()(CBlockIndex *pa, const CBlockIndex *pb) const {
             // First sort by most total work, ...
            
             if (ASSETCHAINS_LWMAPOS) {