diff --git a/db/db_test_util.cc b/db/db_test_util.cc
index 0e29cb2e4..bfed4de40 100644
--- a/db/db_test_util.cc
+++ b/db/db_test_util.cc
@@ -833,7 +833,7 @@ int DBTestBase::GetSstFileCount(std::string path) {
 // this will generate non-overlapping files since it keeps increasing key_idx
 void DBTestBase::GenerateNewFile(int cf, Random* rnd, int* key_idx,
                                  bool nowait) {
-  for (int i = 0; i < 100; i++) {
+  for (int i = 0; i < KNumKeysByGenerateNewFile; i++) {
     ASSERT_OK(Put(cf, Key(*key_idx), RandomString(rnd, (i == 99) ? 1 : 990)));
     (*key_idx)++;
   }
@@ -845,7 +845,7 @@ void DBTestBase::GenerateNewFile(int cf, Random* rnd, int* key_idx,
 
 // this will generate non-overlapping files since it keeps increasing key_idx
 void DBTestBase::GenerateNewFile(Random* rnd, int* key_idx, bool nowait) {
-  for (int i = 0; i < 100; i++) {
+  for (int i = 0; i < KNumKeysByGenerateNewFile; i++) {
     ASSERT_OK(Put(Key(*key_idx), RandomString(rnd, (i == 99) ? 1 : 990)));
     (*key_idx)++;
   }
diff --git a/db/db_test_util.h b/db/db_test_util.h
index 8b22eee5f..b52e43ce9 100644
--- a/db/db_test_util.h
+++ b/db/db_test_util.h
@@ -710,6 +710,7 @@ class DBTestBase : public testing::Test {
   void GenerateNewFile(int fd, Random* rnd, int* key_idx, bool nowait = false);
 
   static const int kNumKeysByGenerateNewRandomFile;
+  static const int KNumKeysByGenerateNewFile = 100;
 
   void GenerateNewRandomFile(Random* rnd, bool nowait = false);
 
diff --git a/db/db_universal_compaction_test.cc b/db/db_universal_compaction_test.cc
index bc18a49b9..1c2100428 100644
--- a/db/db_universal_compaction_test.cc
+++ b/db/db_universal_compaction_test.cc
@@ -890,6 +890,8 @@ TEST_P(DBTestUniversalCompaction, UniversalCompactionFourPaths) {
   options.db_paths.emplace_back(dbname_ + "_2", 300 * 1024);
   options.db_paths.emplace_back(dbname_ + "_3", 500 * 1024);
   options.db_paths.emplace_back(dbname_ + "_4", 1024 * 1024 * 1024);
+  options.memtable_factory.reset(
+      new SpecialSkipListFactory(KNumKeysByGenerateNewFile - 1));
   options.compaction_style = kCompactionStyleUniversal;
   options.compaction_options_universal.size_ratio = 5;
   options.write_buffer_size = 110 << 10;  // 105KB