diff --git a/llvm/lib/Object/MachOObjectFile.cpp b/llvm/lib/Object/MachOObjectFile.cpp
index 31e8be0..ee42bc8 100644
--- a/llvm/lib/Object/MachOObjectFile.cpp
+++ b/llvm/lib/Object/MachOObjectFile.cpp
@@ -86,7 +86,7 @@
 }
 
 unsigned MachOObjectFile::getHeaderSize() const {
-  return MachOObj->getHeaderSize();
+  return is64Bit() ? macho::Header64Size : macho::Header32Size;
 }
 
 StringRef MachOObjectFile::getData(size_t Offset, size_t Size) const {