diff --git a/tools/db_bench_tool.cc b/tools/db_bench_tool.cc
index 90bc54b2f..2af9ccb71 100644
--- a/tools/db_bench_tool.cc
+++ b/tools/db_bench_tool.cc
@@ -1229,6 +1229,9 @@ DEFINE_bool(
 DEFINE_bool(allow_concurrent_memtable_write, true,
             "Allow multi-writers to update mem tables in parallel.");
 
+DEFINE_bool(experimental_allow_mempurge, false,
+            "Allow memtable garbage collection.");
+
 DEFINE_bool(inplace_update_support,
             ROCKSDB_NAMESPACE::Options().inplace_update_support,
             "Support in-place memtable update for smaller or same-size values");
@@ -4302,6 +4305,7 @@ class Benchmark {
     options.delayed_write_rate = FLAGS_delayed_write_rate;
     options.allow_concurrent_memtable_write =
         FLAGS_allow_concurrent_memtable_write;
+    options.experimental_allow_mempurge = FLAGS_experimental_allow_mempurge;
     options.inplace_update_support = FLAGS_inplace_update_support;
     options.inplace_update_num_locks = FLAGS_inplace_update_num_locks;
     options.enable_write_thread_adaptive_yield =