diff --git a/ConflictSet.cpp b/ConflictSet.cpp
index ffe9971..666d9ad 100644
--- a/ConflictSet.cpp
+++ b/ConflictSet.cpp
@@ -64,7 +64,7 @@ struct BoundedFreeListAllocator {
     if (freeListSize == kMaxFreeListSize) {
       return free(p);
     }
-    memcpy(p, &freeList, sizeof(freeList));
+    memcpy((void *)p, &freeList, sizeof(freeList));
     freeList = p;
     ++freeListSize;
   }