diff --git a/ConflictSet.cpp b/ConflictSet.cpp
index 5735b89..25c8a29 100644
--- a/ConflictSet.cpp
+++ b/ConflictSet.cpp
@@ -1863,7 +1863,7 @@ struct __attribute__((visibility("hidden"))) ConflictSet::Impl {
   }
 
   void setOldestVersion(int64_t oldestVersion) {
-    if (oldestVersion <= this->oldestVersion) {
+    if (oldestVersion <= this->oldestVersion || keyUpdates < 1000) {
       return;
     }
     this->oldestVersion = oldestVersion;