diff --git a/llvm/lib/Object/MachOObjectFile.cpp b/llvm/lib/Object/MachOObjectFile.cpp
index 4620fdd..83becc4 100644
--- a/llvm/lib/Object/MachOObjectFile.cpp
+++ b/llvm/lib/Object/MachOObjectFile.cpp
@@ -2573,7 +2573,7 @@
       .Default(false);
 }
 
-unsigned MachOObjectFile::getArch() const {
+Triple::ArchType MachOObjectFile::getArch() const {
   return getArch(getCPUType(*this));
 }