diff --git a/lldb/source/Plugins/ObjectFile/PECOFF/ObjectFilePECOFF.cpp b/lldb/source/Plugins/ObjectFile/PECOFF/ObjectFilePECOFF.cpp
--- a/lldb/source/Plugins/ObjectFile/PECOFF/ObjectFilePECOFF.cpp
+++ b/lldb/source/Plugins/ObjectFile/PECOFF/ObjectFilePECOFF.cpp
@@ -315,6 +315,7 @@
           ParseCOFFOptionalHeader(&offset);
         ParseSectionHeaders(offset);
       }
+      m_data.SetAddressByteSize(GetAddressByteSize());
       return true;
     }
   }
diff --git a/lldb/source/Symbol/ObjectFile.cpp b/lldb/source/Symbol/ObjectFile.cpp
--- a/lldb/source/Symbol/ObjectFile.cpp
+++ b/lldb/source/Symbol/ObjectFile.cpp
@@ -477,13 +477,7 @@
                            DataExtractor &data) const {
   // The entire file has already been mmap'ed into m_data, so just copy from
   // there as the back mmap buffer will be shared with shared pointers.
-  size_t ret = data.SetData(m_data, offset, length);
-  // DataExtractor::SetData copies the address byte size from m_data, but
-  // m_data's address byte size is only set from sizeof(void*), and we can't
-  // access subclasses GetAddressByteSize() when setting up m_data in the
-  // constructor.
-  data.SetAddressByteSize(GetAddressByteSize());
-  return ret;
+  return data.SetData(m_data, offset, length);
 }
 
 size_t ObjectFile::CopyData(lldb::offset_t offset, size_t length,