diff --git a/pdfminer/psparser.py b/pdfminer/psparser.py
index 8fc61ed2..b4869560 100755
--- a/pdfminer/psparser.py
+++ b/pdfminer/psparser.py
@@ -452,7 +452,7 @@ def _parse_string_1(self, s: bytes, i: int) -> int:
         elif self.oct:
             chrcode = int(self.oct, 8)
             assert chrcode < 256, "Invalid octal %s (%d)" % (repr(self.oct), chrcode)
-            self._curtoken += bytes((int(self.oct, 8),))
+            self._curtoken += bytes((chrcode,))
             self._parse1 = self._parse_string
             return i