diff --git a/SkipList.cpp b/SkipList.cpp
index 304717f..41979b3 100644
--- a/SkipList.cpp
+++ b/SkipList.cpp
@@ -710,8 +710,6 @@ private:
   };
 };
 
-struct SkipListConflictSet {};
-
 struct __attribute__((visibility("hidden"))) ConflictSet::Impl {
   Impl(int64_t oldestVersion)
       : oldestVersion(oldestVersion), newestVersion(oldestVersion),