diff --git a/table/full_filter_bits_builder.h b/table/full_filter_bits_builder.h
index b3be7e897..851ed1e2a 100644
--- a/table/full_filter_bits_builder.h
+++ b/table/full_filter_bits_builder.h
@@ -51,6 +51,7 @@ class FullFilterBitsBuilder : public FilterBitsBuilder {
                           uint32_t* num_lines);
 
  private:
+  friend class FullFilterBlockTest_DuplicateEntries_Test;
   size_t bits_per_key_;
   size_t num_probes_;
   std::vector<uint32_t> hash_entries_;
diff --git a/table/full_filter_block.cc b/table/full_filter_block.cc
index feab0b7a4..4af3125ba 100644
--- a/table/full_filter_block.cc
+++ b/table/full_filter_block.cc
@@ -23,10 +23,23 @@ FullFilterBlockBuilder::FullFilterBlockBuilder(
 }
 
 void FullFilterBlockBuilder::Add(const Slice& key) {
+  const bool add_prefix = prefix_extractor_ && prefix_extractor_->InDomain(key);
   if (whole_key_filtering_) {
-    AddKey(key);
+    if (!add_prefix) {
+      AddKey(key);
+    } else {
+      // if both whole_key and prefix are added to bloom then we will have whole
+      // key and prefix addition being interleaved and thus cannot rely on the
+      // bits builder to properly detect the duplicates by comparing with the
+      // last item.
+      Slice last_whole_key = Slice(last_whole_key_str_);
+      if (last_whole_key.compare(key) != 0) {
+        AddKey(key);
+        last_whole_key_str_ = key.ToString();
+      }
+    }
   }
-  if (prefix_extractor_ && prefix_extractor_->InDomain(key)) {
+  if (add_prefix) {
     AddPrefix(key);
   }
 }
@@ -40,7 +53,19 @@ inline void FullFilterBlockBuilder::AddKey(const Slice& key) {
 // Add prefix to filter if needed
 inline void FullFilterBlockBuilder::AddPrefix(const Slice& key) {
   Slice prefix = prefix_extractor_->Transform(key);
-  AddKey(prefix);
+  if (whole_key_filtering_) {
+    // if both whole_key and prefix are added to bloom then we will have whole
+    // key and prefix addition being interleaved and thus cannot rely on the
+    // bits builder to properly detect the duplicates by comparing with the last
+    // item.
+    Slice last_prefix = Slice(last_prefix_str_);
+    if (last_prefix.compare(prefix) != 0) {
+      AddKey(prefix);
+      last_prefix_str_ = prefix.ToString();
+    }
+  } else {
+    AddKey(prefix);
+  }
 }
 
 Slice FullFilterBlockBuilder::Finish(const BlockHandle& /*tmp*/,
diff --git a/table/full_filter_block.h b/table/full_filter_block.h
index 6aec5530a..eb2703a4d 100644
--- a/table/full_filter_block.h
+++ b/table/full_filter_block.h
@@ -59,6 +59,8 @@ class FullFilterBlockBuilder : public FilterBlockBuilder {
   // should NOT dereference them.
   const SliceTransform* prefix_extractor_;
   bool whole_key_filtering_;
+  std::string last_whole_key_str_;
+  std::string last_prefix_str_;
 
   uint32_t num_added_;
   std::unique_ptr<const char[]> filter_data_;
diff --git a/table/full_filter_block_test.cc b/table/full_filter_block_test.cc
index 2e73612d1..73541264a 100644
--- a/table/full_filter_block_test.cc
+++ b/table/full_filter_block_test.cc
@@ -6,6 +6,7 @@
 #include "table/full_filter_block.h"
 
 #include "rocksdb/filter_policy.h"
+#include "table/full_filter_bits_builder.h"
 #include "util/coding.h"
 #include "util/hash.h"
 #include "util/string_util.h"
@@ -160,6 +161,24 @@ TEST_F(FullFilterBlockTest, EmptyBuilder) {
   ASSERT_TRUE(reader.KeyMayMatch("foo"));
 }
 
+TEST_F(FullFilterBlockTest, DuplicateEntries) {
+  std::unique_ptr<const SliceTransform> prefix_extractor(
+      NewFixedPrefixTransform(7));
+  auto bits_builder = dynamic_cast<FullFilterBitsBuilder*>(
+      table_options_.filter_policy->GetFilterBitsBuilder());
+  const bool WHOLE_KEY = true;
+  FullFilterBlockBuilder builder(prefix_extractor.get(), WHOLE_KEY,
+                                 bits_builder);
+  ASSERT_EQ(0, builder.NumAdded());
+  builder.Add("prefix1key1");
+  builder.Add("prefix1key1");
+  builder.Add("prefix1key2");
+  builder.Add("prefix1key3");
+  builder.Add("prefix2key4");
+  // two prefix adn 4 keys
+  ASSERT_EQ(2 + 4, bits_builder->hash_entries_.size());
+}
+
 TEST_F(FullFilterBlockTest, SingleChunk) {
   FullFilterBlockBuilder builder(
       nullptr, true, table_options_.filter_policy->GetFilterBitsBuilder());