diff --git a/lib/Fuzzer/FuzzerMutate.cpp b/lib/Fuzzer/FuzzerMutate.cpp
index bc2cf2c1bdb..5998ef9d319 100644
--- a/lib/Fuzzer/FuzzerMutate.cpp
+++ b/lib/Fuzzer/FuzzerMutate.cpp
@@ -43,8 +43,6 @@ MutationDispatcher::MutationDispatcher(Random &Rand,
           {&MutationDispatcher::Mutate_CrossOver, "CrossOver"},
           {&MutationDispatcher::Mutate_AddWordFromManualDictionary,
            "ManualDict"},
-          {&MutationDispatcher::Mutate_AddWordFromTemporaryAutoDictionary,
-           "TempAutoDict"},
           {&MutationDispatcher::Mutate_AddWordFromPersistentAutoDictionary,
            "PersAutoDict"},
       });
@@ -165,11 +163,6 @@ size_t MutationDispatcher::Mutate_AddWordFromManualDictionary(uint8_t *Data,
   return AddWordFromDictionary(ManualDictionary, Data, Size, MaxSize);
 }
 
-size_t MutationDispatcher::Mutate_AddWordFromTemporaryAutoDictionary(
-    uint8_t *Data, size_t Size, size_t MaxSize) {
-  return AddWordFromDictionary(TempAutoDictionary, Data, Size, MaxSize);
-}
-
 size_t MutationDispatcher::ApplyDictionaryEntry(uint8_t *Data, size_t Size,
                                                 size_t MaxSize,
                                                 DictionaryEntry &DE) {
@@ -537,14 +530,4 @@ void MutationDispatcher::AddWordToManualDictionary(const Word &W) {
       {W, std::numeric_limits<size_t>::max()});
 }
 
-void MutationDispatcher::AddWordToAutoDictionary(DictionaryEntry DE) {
-  static const size_t kMaxAutoDictSize = 1 << 14;
-  if (TempAutoDictionary.size() >= kMaxAutoDictSize) return;
-  TempAutoDictionary.push_back(DE);
-}
-
-void MutationDispatcher::ClearAutoDictionary() {
-  TempAutoDictionary.clear();
-}
-
 }  // namespace fuzzer
diff --git a/lib/Fuzzer/FuzzerMutate.h b/lib/Fuzzer/FuzzerMutate.h
index 8c8fb3fd74c..84b04c0dbf3 100644
--- a/lib/Fuzzer/FuzzerMutate.h
+++ b/lib/Fuzzer/FuzzerMutate.h
@@ -52,10 +52,6 @@ public:
   size_t Mutate_AddWordFromManualDictionary(uint8_t *Data, size_t Size,
                                             size_t MaxSize);
 
-  /// Mutates data by adding a word from the temporary automatic dictionary.
-  size_t Mutate_AddWordFromTemporaryAutoDictionary(uint8_t *Data, size_t Size,
-                                                   size_t MaxSize);
-
   /// Mutates data by adding a word from the TORC.
   size_t Mutate_AddWordFromTORC(uint8_t *Data, size_t Size, size_t MaxSize);
 
@@ -84,8 +80,6 @@ public:
 
   void AddWordToManualDictionary(const Word &W);
 
-  void AddWordToAutoDictionary(DictionaryEntry DE);
-  void ClearAutoDictionary();
   void PrintRecommendedDictionary();
 
   void SetCorpus(const InputCorpus *Corpus) { this->Corpus = Corpus; }
diff --git a/lib/Fuzzer/test/FuzzerUnittest.cpp b/lib/Fuzzer/test/FuzzerUnittest.cpp
index 1053c28527b..1d87e2cf183 100644
--- a/lib/Fuzzer/test/FuzzerUnittest.cpp
+++ b/lib/Fuzzer/test/FuzzerUnittest.cpp
@@ -424,35 +424,6 @@ TEST(FuzzerMutate, AddWordFromDictionary2) {
   TestAddWordFromDictionary(&MutationDispatcher::Mutate, 1 << 15);
 }
 
-void TestAddWordFromDictionaryWithHint(Mutator M, int NumIter) {
-  std::unique_ptr<ExternalFunctions> t(new ExternalFunctions());
-  fuzzer::EF = t.get();
-  Random Rand(0);
-  MutationDispatcher MD(Rand, {});
-  uint8_t W[] = {0xAA, 0xBB, 0xCC, 0xDD, 0xFF, 0xEE, 0xEF};
-  size_t PosHint = 7777;
-  MD.AddWordToAutoDictionary({Word(W, sizeof(W)), PosHint});
-  int FoundMask = 0;
-  for (int i = 0; i < NumIter; i++) {
-    uint8_t T[10000];
-    memset(T, 0, sizeof(T));
-    size_t NewSize = (MD.*M)(T, 9000, 10000);
-    if (NewSize >= PosHint + sizeof(W) &&
-        !memcmp(W, T + PosHint, sizeof(W)))
-      FoundMask = 1;
-  }
-  EXPECT_EQ(FoundMask, 1);
-}
-
-TEST(FuzzerMutate, AddWordFromDictionaryWithHint1) {
-  TestAddWordFromDictionaryWithHint(
-      &MutationDispatcher::Mutate_AddWordFromTemporaryAutoDictionary, 1 << 5);
-}
-
-TEST(FuzzerMutate, AddWordFromDictionaryWithHint2) {
-  TestAddWordFromDictionaryWithHint(&MutationDispatcher::Mutate, 1 << 10);
-}
-
 void TestChangeASCIIInteger(Mutator M, int NumIter) {
   std::unique_ptr<ExternalFunctions> t(new ExternalFunctions());
   fuzzer::EF = t.get();