diff --git a/ConflictSet.cpp b/ConflictSet.cpp
index e7eed08..24fe335 100644
--- a/ConflictSet.cpp
+++ b/ConflictSet.cpp
@@ -266,6 +266,10 @@ struct BoundedFreeListAllocator {
         memcpy(&freeList, freeList, sizeof(freeList));
         --freeListSize;
         VALGRIND_MAKE_MEM_UNDEFINED(n, sizeof(T));
+#ifndef NDEBUG
+        VALGRIND_MAKE_MEM_DEFINED(&n->partialKeyCapacity,
+                                  sizeof(n->partialKeyCapacity));
+#endif
         return new (n) T;
       }
       VALGRIND_MAKE_MEM_NOACCESS(n, sizeof(T));