diff --git a/llvm/utils/FileCheck/FileCheck.cpp b/llvm/utils/FileCheck/FileCheck.cpp
index 07294a3..5e2d93b 100644
--- a/llvm/utils/FileCheck/FileCheck.cpp
+++ b/llvm/utils/FileCheck/FileCheck.cpp
@@ -667,7 +667,7 @@
                           std::vector<CheckString> &CheckStrings) {
   OwningPtr<MemoryBuffer> File;
   if (error_code ec =
-        MemoryBuffer::getFileOrSTDIN(CheckFilename.c_str(), File)) {
+        MemoryBuffer::getFileOrSTDIN(CheckFilename, File)) {
     errs() << "Could not open check file '" << CheckFilename << "': "
            << ec.message() << '\n';
     return true;
@@ -1015,7 +1015,7 @@
   // Open the file to check and add it to SourceMgr.
   OwningPtr<MemoryBuffer> File;
   if (error_code ec =
-        MemoryBuffer::getFileOrSTDIN(InputFilename.c_str(), File)) {
+        MemoryBuffer::getFileOrSTDIN(InputFilename, File)) {
     errs() << "Could not open input file '" << InputFilename << "': "
            << ec.message() << '\n';
     return 2;