diff --git a/llvm/lib/Object/COFFObjectFile.cpp b/llvm/lib/Object/COFFObjectFile.cpp
index 06ac6df..b544fa5 100644
--- a/llvm/lib/Object/COFFObjectFile.cpp
+++ b/llvm/lib/Object/COFFObjectFile.cpp
@@ -895,7 +895,7 @@
   }
 }
 
-unsigned COFFObjectFile::getArch() const {
+Triple::ArchType COFFObjectFile::getArch() const {
   switch (getMachine()) {
   case COFF::IMAGE_FILE_MACHINE_I386:
     return Triple::x86;