diff --git a/llvm/include/llvm/BinaryFormat/MsgPackDocument.h b/llvm/include/llvm/BinaryFormat/MsgPackDocument.h
--- a/llvm/include/llvm/BinaryFormat/MsgPackDocument.h
+++ b/llvm/include/llvm/BinaryFormat/MsgPackDocument.h
@@ -181,6 +181,11 @@
     return !(Lhs < Rhs) && !(Rhs < Lhs);
   }
 
+  /// Inequality operator
+  friend bool operator!=(const DocNode &Lhs, const DocNode &Rhs) {
+    return !(Lhs == Rhs);
+  }
+
   /// Convert this node to a string, assuming it is scalar.
   std::string toString() const;
 
diff --git a/llvm/unittests/BinaryFormat/MsgPackDocumentTest.cpp b/llvm/unittests/BinaryFormat/MsgPackDocumentTest.cpp
--- a/llvm/unittests/BinaryFormat/MsgPackDocumentTest.cpp
+++ b/llvm/unittests/BinaryFormat/MsgPackDocumentTest.cpp
@@ -13,6 +13,16 @@
 using namespace llvm;
 using namespace msgpack;
 
+TEST(MsgPackDocument, DocNodeTest) {
+  Document Doc;
+
+  DocNode Int1 = Doc.getNode(1), Int2 = Doc.getNode(2);
+  DocNode Str1 = Doc.getNode("ab"), Str2 = Doc.getNode("ab");
+
+  ASSERT_TRUE(Int1 != Int2);
+  ASSERT_TRUE(Str1 == Str2);
+}
+
 TEST(MsgPackDocument, TestReadInt) {
   Document Doc;
   bool Ok = Doc.readFromBlob(StringRef("\xd0\x00", 2), /*Multi=*/false);