diff --git a/llvm/include/llvm/Demangle/MicrosoftDemangle.h b/llvm/include/llvm/Demangle/MicrosoftDemangle.h
index 0403136616019a..6f2d0416901ecb 100644
--- a/llvm/include/llvm/Demangle/MicrosoftDemangle.h
+++ b/llvm/include/llvm/Demangle/MicrosoftDemangle.h
@@ -9,10 +9,8 @@
 #ifndef LLVM_DEMANGLE_MICROSOFTDEMANGLE_H
 #define LLVM_DEMANGLE_MICROSOFTDEMANGLE_H
 
-#include "llvm/Demangle/DemangleConfig.h"
 #include "llvm/Demangle/MicrosoftDemangleNodes.h"
 #include "llvm/Demangle/StringView.h"
-#include "llvm/Demangle/Utility.h"
 
 #include <utility>
 
diff --git a/llvm/include/llvm/Demangle/MicrosoftDemangleNodes.h b/llvm/include/llvm/Demangle/MicrosoftDemangleNodes.h
index 1455dad3d1b2bb..8ad2472364b4c7 100644
--- a/llvm/include/llvm/Demangle/MicrosoftDemangleNodes.h
+++ b/llvm/include/llvm/Demangle/MicrosoftDemangleNodes.h
@@ -13,7 +13,6 @@
 #ifndef LLVM_DEMANGLE_MICROSOFTDEMANGLENODES_H
 #define LLVM_DEMANGLE_MICROSOFTDEMANGLENODES_H
 
-#include "llvm/Demangle/DemangleConfig.h"
 #include "llvm/Demangle/StringView.h"
 #include <array>
 #include <cstdint>
diff --git a/llvm/lib/Demangle/ItaniumDemangle.cpp b/llvm/lib/Demangle/ItaniumDemangle.cpp
index 3f68f76761ce02..1a5db755e37b52 100644
--- a/llvm/lib/Demangle/ItaniumDemangle.cpp
+++ b/llvm/lib/Demangle/ItaniumDemangle.cpp
@@ -19,9 +19,7 @@
 #include <cstdlib>
 #include <cstring>
 #include <functional>
-#include <numeric>
 #include <utility>
-#include <vector>
 
 using namespace llvm;
 using namespace llvm::itanium_demangle;
diff --git a/llvm/lib/Demangle/MicrosoftDemangleNodes.cpp b/llvm/lib/Demangle/MicrosoftDemangleNodes.cpp
index 32d8dff66c3f83..d07d05a08c5566 100644
--- a/llvm/lib/Demangle/MicrosoftDemangleNodes.cpp
+++ b/llvm/lib/Demangle/MicrosoftDemangleNodes.cpp
@@ -11,7 +11,6 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/Demangle/MicrosoftDemangleNodes.h"
-#include "llvm/Demangle/DemangleConfig.h"
 #include "llvm/Demangle/Utility.h"
 #include <cctype>
 #include <string>