Index: src/widgets/GraphGridLayout.cpp
--- src/widgets/GraphGridLayout.cpp.orig
+++ src/widgets/GraphGridLayout.cpp
@@ -526,7 +526,7 @@ void GraphGridLayout::calculateEdgeMainColumn(GraphGri
     // to contain blocks above sweep line and query for nearest column which isn't blocked by a block.
 
     struct Event {
-        size_t blockId;
+        ut64 blockId;
         size_t edgeId;
         int row;
         enum Type {