diff --git a/ConflictSet.cpp b/ConflictSet.cpp
index 561c352..be05a46 100644
--- a/ConflictSet.cpp
+++ b/ConflictSet.cpp
@@ -322,7 +322,8 @@ inline void Node3::copyChildrenAndKeyFrom(const Node0 &other) {
 inline void Node3::copyChildrenAndKeyFrom(const Node3 &other) {
   memcpy((char *)this + kNodeCopyBegin, (char *)&other + kNodeCopyBegin,
          kNodeCopySize);
-  memcpy(index, other.index, sizeof(*this) - sizeof(Node) + partialKeyLen);
+  memcpy(index, other.index, sizeof(*this) - sizeof(Node));
+  memcpy(partialKey(), &other + 1, partialKeyLen);
   for (int i = 0; i < numChildren; ++i) {
     assert(children[i].child->parent == &other);
     children[i].child->parent = this;