diff --git a/ConflictSet.cpp b/ConflictSet.cpp
index dde25fd..ceb3b71 100644
--- a/ConflictSet.cpp
+++ b/ConflictSet.cpp
@@ -899,6 +899,7 @@ void freeAndMakeCapacityAtLeast(Node *&self, int capacity,
   case Type_Node48: {
     auto *self48 = (Node48 *)self;
     auto *newSelf = allocators->node48.allocate(capacity);
+    memset(newSelf->index, -1, sizeof(newSelf->index));
     memcpy((char *)newSelf + kNodeCopyBegin, (char *)self + kNodeCopyBegin,
            kNodeCopySize);
     memcpy(newSelf->partialKey(), self48->partialKey(), self->partialKeyLen);
@@ -926,6 +927,9 @@ void freeAndMakeCapacityAtLeast(Node *&self, int capacity,
   case Type_Node256: {
     auto *self256 = (Node256 *)self;
     auto *newSelf = allocators->node256.allocate(capacity);
+    for (int i = 0; i < 256; ++i) {
+      newSelf->children[i].child = nullptr;
+    }
     memcpy((char *)newSelf + kNodeCopyBegin, (char *)self + kNodeCopyBegin,
            kNodeCopySize);
     memcpy(newSelf->partialKey(), self256->partialKey(), self->partialKeyLen);