diff --git a/src/V3Partition.cpp b/src/V3Partition.cpp
index 3ea1bfd85..de8f72e91 100644
--- a/src/V3Partition.cpp
+++ b/src/V3Partition.cpp
@@ -166,7 +166,6 @@ private:
     //               // from graph-start to current node, or REVERSE
     //               // from graph-end to current node.
     T_CostAccessor* const m_accessp;  // Access cost and CPs on V3GraphVertex's.
-    vluint64_t m_generation = 0;  // Mark each vertex with this number;
     //                        // confirm we only process each vertex once.
     bool m_slowAsserts;  // Enable nontrivial asserts
     SortByValueMap<V3GraphVertex*, uint32_t> m_pending;  // Pending rescores