diff --git a/ConflictSet.cpp b/ConflictSet.cpp
index be05a46..155c27d 100644
--- a/ConflictSet.cpp
+++ b/ConflictSet.cpp
@@ -1078,7 +1078,7 @@ void freeAndMakeCapacityAtLeast(Node *&self, int capacity,
 void maybeDecreaseCapacity(Node *&self, NodeAllocators *allocators,
                            ConflictSet::Impl *impl) {
   const int maxCapacity =
-      (self->numChildren + int(self->entryPresent)) * self->partialKeyLen;
+      (self->numChildren + int(self->entryPresent)) * (self->partialKeyLen + 1);
   if (self->getCapacity() <= maxCapacity) {
     return;
   }