diff --git a/clang/lib/AST/MicrosoftMangle.cpp b/clang/lib/AST/MicrosoftMangle.cpp
index c5db936..0d4080c 100644
--- a/clang/lib/AST/MicrosoftMangle.cpp
+++ b/clang/lib/AST/MicrosoftMangle.cpp
@@ -1268,8 +1268,7 @@
 
 void MicrosoftCXXNameMangler::mangleSourceName(StringRef Name) {
   // <source name> ::= <identifier> @
-  BackRefVec::iterator Found =
-      std::find(NameBackReferences.begin(), NameBackReferences.end(), Name);
+  BackRefVec::iterator Found = llvm::find(NameBackReferences, Name);
   if (Found == NameBackReferences.end()) {
     if (NameBackReferences.size() < 10)
       NameBackReferences.push_back(Name);
@@ -3462,8 +3461,7 @@
     } else {
       const char SpecialChars[] = {',', '/',  '\\', ':',  '.',
                                    ' ', '\n', '\t', '\'', '-'};
-      const char *Pos =
-          std::find(std::begin(SpecialChars), std::end(SpecialChars), Byte);
+      const char *Pos = llvm::find(SpecialChars, Byte);
       if (Pos != std::end(SpecialChars)) {
         Mangler.getStream() << '?' << (Pos - std::begin(SpecialChars));
       } else {