diff --git a/pefile.py b/pefile.py
index 12d2892..53d6e41 100644
--- a/pefile.py
+++ b/pefile.py
@@ -6294,7 +6294,7 @@ def get_memory_mapped_image(self, max_virtual_address=0x10000000, ImageBase=None
             self.relocate_image(ImageBase)
 
         # Collect all sections in one code block
-        mapped_data = self.__data__[:]
+        mapped_data = self.header
         for section in self.sections:
             # Miscellaneous integrity tests.
             # Some packer will set these to bogus values to make tools go nuts.