diff --git a/pe_tools/pe_parser.py b/pe_tools/pe_parser.py
index 4f8620f..9bd6663 100644
--- a/pe_tools/pe_parser.py
+++ b/pe_tools/pe_parser.py
@@ -275,6 +275,7 @@ def __init__(self, blob, verify_checksum=False):
             raise RuntimeError('Not a PE file: PE signature is missing.')
 
         hdr = _IMAGE_FILE_HEADER.unpack_from_io(fin)
+        sect_offs = fin.tell() + hdr.SizeOfOptionalHeader
         opt_sig, = struct.unpack('<H', fin.read(2))
         if opt_sig == IMAGE_NT_OPTIONAL_HDR32_MAGIC:
             opt = _IMAGE_OPTIONAL_HEADER32.unpack_from_io(fin)
@@ -299,6 +300,8 @@ def __init__(self, blob, verify_checksum=False):
 
         dds = [_IMAGE_DATA_DIRECTORY.unpack_from_io(fin) for dd_idx in range(opt.NumberOfRvaAndSizes)]
 
+        fin.seek(sect_offs)
+        
         def make_pe_section(idx, hdr):
             name = hdr.Name.rstrip(b'\0')