diff --git a/libr/bin/format/mdmp/mdmp.c b/libr/bin/format/mdmp/mdmp.c
index 82a983ea56..774da4e08b 100644
--- a/libr/bin/format/mdmp/mdmp.c
+++ b/libr/bin/format/mdmp/mdmp.c
@@ -437,7 +437,7 @@ static bool r_bin_mdmp_init_directory_entry(struct r_bin_mdmp_obj *obj, struct m
 
 		for (i = 0; i < memory_list->number_of_memory_ranges; i++) {
 			memories = (struct minidump_memory_descriptor *)(&(memory_list->memory_ranges));
-			ut64 start_offset = entry->location.rva
+			ut64 start_offset = (ut64)entry->location.rva
 			                + r_offsetof (struct minidump_memory_list, memory_ranges);
 			ut64 needed_space = (i + 1) * sizeof (memories[0]);
 			if (start_offset + needed_space > obj->b->length