diff --git a/ConflictSet.cpp b/ConflictSet.cpp
index bfb683a..d1f8ef2 100644
--- a/ConflictSet.cpp
+++ b/ConflictSet.cpp
@@ -959,7 +959,7 @@ template <class NodeT> Node *getChildGeqSimd(NodeT *self, int child) {
   static_assert(NodeT::kMaxNodes <= 16);
   assume(self->numChildren <= NodeT::kMaxNodes);
   uint64_t mask = self->numChildren == 16
-                      ? uint64_t(nullptr)
+                      ? uint64_t(-1)
                       : (uint64_t(1) << (self->numChildren * 4)) - 1;
   // 0xf for each 0xff (within mask)
   uint64_t bitfield =