diff --git a/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp b/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
index 41eb9fd0b2d7..d1368d80e590 100644
--- a/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
+++ b/llvm/lib/Target/AArch64/AArch64ISelLowering.cpp
@@ -76,7 +76,7 @@ static TargetLoweringObjectFile *createTLOF(const Triple &TT) {
   return new AArch64_ELFTargetObjectFile();
 }
 
-AArch64TargetLowering::AArch64TargetLowering(TargetMachine &TM)
+AArch64TargetLowering::AArch64TargetLowering(const TargetMachine &TM)
     : TargetLowering(TM, createTLOF(Triple(TM.getTargetTriple()))) {
   Subtarget = &TM.getSubtarget<AArch64Subtarget>();
 
diff --git a/llvm/lib/Target/AArch64/AArch64ISelLowering.h b/llvm/lib/Target/AArch64/AArch64ISelLowering.h
index dd9e5db468fe..3e960ca75f58 100644
--- a/llvm/lib/Target/AArch64/AArch64ISelLowering.h
+++ b/llvm/lib/Target/AArch64/AArch64ISelLowering.h
@@ -204,7 +204,7 @@ class AArch64TargetLowering : public TargetLowering {
   bool RequireStrictAlign;
 
 public:
-  explicit AArch64TargetLowering(TargetMachine &TM);
+  explicit AArch64TargetLowering(const TargetMachine &TM);
 
   /// Selects the correct CCAssignFn for a given CallingConvention value.
   CCAssignFn *CCAssignFnForCall(CallingConv::ID CC, bool IsVarArg) const;
diff --git a/llvm/lib/Target/AArch64/AArch64Subtarget.cpp b/llvm/lib/Target/AArch64/AArch64Subtarget.cpp
index 641a67fe629b..b3647fe4343a 100644
--- a/llvm/lib/Target/AArch64/AArch64Subtarget.cpp
+++ b/llvm/lib/Target/AArch64/AArch64Subtarget.cpp
@@ -43,8 +43,8 @@ AArch64Subtarget::initializeSubtargetDependencies(StringRef FS) {
 
 AArch64Subtarget::AArch64Subtarget(const std::string &TT,
                                    const std::string &CPU,
-                                   const std::string &FS, TargetMachine &TM,
-                                   bool LittleEndian)
+                                   const std::string &FS,
+                                   const TargetMachine &TM, bool LittleEndian)
     : AArch64GenSubtargetInfo(TT, CPU, FS), ARMProcFamily(Others),
       HasFPARMv8(false), HasNEON(false), HasCrypto(false), HasCRC(false),
       HasZeroCycleRegMove(false), HasZeroCycleZeroing(false), CPUString(CPU),
diff --git a/llvm/lib/Target/AArch64/AArch64Subtarget.h b/llvm/lib/Target/AArch64/AArch64Subtarget.h
index 5663fafeaca7..b2cd0cd57383 100644
--- a/llvm/lib/Target/AArch64/AArch64Subtarget.h
+++ b/llvm/lib/Target/AArch64/AArch64Subtarget.h
@@ -69,7 +69,8 @@ public:
   /// This constructor initializes the data members to match that
   /// of the specified triple.
   AArch64Subtarget(const std::string &TT, const std::string &CPU,
-		   const std::string &FS, TargetMachine &TM, bool LittleEndian);
+                   const std::string &FS, const TargetMachine &TM,
+                   bool LittleEndian);
 
   const AArch64SelectionDAGInfo *getSelectionDAGInfo() const override {
     return &TSInfo;