diff --git a/db/db_tailing_iter_test.cc b/db/db_tailing_iter_test.cc
index 9bce29a43..93f12a76d 100644
--- a/db/db_tailing_iter_test.cc
+++ b/db/db_tailing_iter_test.cc
@@ -121,7 +121,12 @@ TEST_F(DBTestTailingIterator, TailingIteratorSeekToNext) {
 }
 
 TEST_F(DBTestTailingIterator, TailingIteratorTrimSeekToNext) {
-  CreateAndReopenWithCF({"pikachu"}, CurrentOptions());
+  const uint64_t k20KB = 20 * 1024;
+  Options options;
+  options.write_buffer_size = k20KB;
+  options.max_write_buffer_number = 6;
+  options.min_write_buffer_number_to_merge = 5;
+  CreateAndReopenWithCF({"pikachu"}, options);
   ReadOptions read_options;
   read_options.tailing = true;
 
diff --git a/db/forward_iterator.cc b/db/forward_iterator.cc
index 2522f56e7..ea493060b 100644
--- a/db/forward_iterator.cc
+++ b/db/forward_iterator.cc
@@ -238,20 +238,11 @@ void ForwardIterator::SeekInternal(const Slice& internal_key,
     }
     for (size_t i = 0; i < imm_iters_.size(); i++) {
       auto* m = imm_iters_[i];
-      if (!m) {
-        continue;
-      }
       seek_to_first ? m->SeekToFirst() : m->Seek(internal_key);
       if (!m->status().ok()) {
         immutable_status_ = m->status();
       } else if (m->Valid()) {
-        if (!IsOverUpperBound(m->key())) {
-          immutable_min_heap_.push(m);
-        } else {
-          has_iter_trimmed_for_upper_bound_ = true;
-          delete m;
-          imm_iters_[i] = nullptr;
-        }
+        immutable_min_heap_.push(m);
       }
     }
 
@@ -624,19 +615,6 @@ bool ForwardIterator::NeedToRebuildTrimmed(const Slice& target) {
 }
 
 void ForwardIterator::DeleteCurrentIter() {
-  for (size_t i = 0; i < imm_iters_.size(); i++) {
-    auto& m = imm_iters_[i];
-    if (!m) {
-      continue;
-    }
-    if (m == current_) {
-      has_iter_trimmed_for_upper_bound_ = true;
-      delete m;
-      m = nullptr;
-      return;
-    }
-  }
-
   const VersionStorageInfo* vstorage = sv_->current->storage_info();
   const std::vector<FileMetaData*>& l0 = vstorage->LevelFiles(0);
   for (uint32_t i = 0; i < l0.size(); ++i) {
@@ -667,12 +645,6 @@ bool ForwardIterator::TEST_CheckDeletedIters() {
   if (!has_iter_trimmed_for_upper_bound_) {
     return false;
   }
-  for (size_t i = 0; i < imm_iters_.size(); i++) {
-    auto& m = imm_iters_[i];
-    if (!m) {
-      return true;
-    }
-  }
 
   const VersionStorageInfo* vstorage = sv_->current->storage_info();
   const std::vector<FileMetaData*>& l0 = vstorage->LevelFiles(0);