diff --git a/lib/Target/AArch64/AArch64ISelLowering.h b/lib/Target/AArch64/AArch64ISelLowering.h
index b3c3b1cecfe..143c5528ce8 100644
--- a/lib/Target/AArch64/AArch64ISelLowering.h
+++ b/lib/Target/AArch64/AArch64ISelLowering.h
@@ -350,7 +350,7 @@ public:
 
   SDValue PerformDAGCombine(SDNode *N,DAGCombinerInfo &DCI) const override;
 
-  unsigned getRegisterByName(const char* RegName) const;
+  unsigned getRegisterByName(const char* RegName) const override;
 
   /// isFMAFasterThanFMulAndFAdd - Return true if an FMA operation is faster
   /// than a pair of fmul and fadd instructions. fmuladd intrinsics will be
diff --git a/lib/Target/ARM/ARMISelLowering.h b/lib/Target/ARM/ARMISelLowering.h
index c75433ac126..03c2e34df5c 100644
--- a/lib/Target/ARM/ARMISelLowering.h
+++ b/lib/Target/ARM/ARMISelLowering.h
@@ -471,7 +471,7 @@ namespace llvm {
     SDValue LowerFSINCOS(SDValue Op, SelectionDAG &DAG) const;
     SDValue LowerDivRem(SDValue Op, SelectionDAG &DAG) const;
 
-    unsigned getRegisterByName(const char* RegName) const;
+    unsigned getRegisterByName(const char* RegName) const override;
 
     /// isFMAFasterThanFMulAndFAdd - Return true if an FMA operation is faster
     /// than a pair of fmul and fadd instructions. fmuladd intrinsics will be
diff --git a/lib/Target/ARM64/ARM64ISelLowering.h b/lib/Target/ARM64/ARM64ISelLowering.h
index 8b321ee9d03..d7d08fa52f5 100644
--- a/lib/Target/ARM64/ARM64ISelLowering.h
+++ b/lib/Target/ARM64/ARM64ISelLowering.h
@@ -411,7 +411,7 @@ private:
 
   ConstraintType
   getConstraintType(const std::string &Constraint) const override;
-  unsigned getRegisterByName(const char* RegName) const;
+  unsigned getRegisterByName(const char* RegName) const override;
 
   /// Examine constraint string and operand type and determine a weight value.
   /// The operand object must already have been set up with the operand type.
diff --git a/lib/Target/X86/X86ISelLowering.h b/lib/Target/X86/X86ISelLowering.h
index 3ddf3953573..ff571e47200 100644
--- a/lib/Target/X86/X86ISelLowering.h
+++ b/lib/Target/X86/X86ISelLowering.h
@@ -786,7 +786,7 @@ namespace llvm {
       return nullptr; // nothing to do, move along.
     }
 
-    unsigned getRegisterByName(const char* RegName) const;
+    unsigned getRegisterByName(const char* RegName) const override;
 
     /// createFastISel - This method returns a target specific FastISel object,
     /// or null if the target does not support "fast" ISel.