diff --git a/include/llvm/CodeGen/SelectionDAGNodes.h b/include/llvm/CodeGen/SelectionDAGNodes.h
index 216d40c18f2..aae304df2a2 100644
--- a/include/llvm/CodeGen/SelectionDAGNodes.h
+++ b/include/llvm/CodeGen/SelectionDAGNodes.h
@@ -1493,7 +1493,8 @@ public:
   /// undefined.  isBigEndian describes the endianness of the target.
   bool isConstantSplat(APInt &SplatValue, APInt &SplatUndef,
                        unsigned &SplatBitSize, bool &HasAnyUndefs,
-                       unsigned MinSplatBits = 0, bool isBigEndian = false);
+                       unsigned MinSplatBits = 0,
+                       bool isBigEndian = false) const;
 
   bool isConstant() const;
 
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index 3ab8ad8bf15..e81c159dcb2 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -6483,7 +6483,7 @@ bool BuildVectorSDNode::isConstantSplat(APInt &SplatValue,
                                         unsigned &SplatBitSize,
                                         bool &HasAnyUndefs,
                                         unsigned MinSplatBits,
-                                        bool isBigEndian) {
+                                        bool isBigEndian) const {
   EVT VT = getValueType(0);
   assert(VT.isVector() && "Expected a vector type");
   unsigned sz = VT.getSizeInBits();