diff --git a/pdfminer/pdfinterp.py b/pdfminer/pdfinterp.py
index 255dd93..0c2328d 100644
--- a/pdfminer/pdfinterp.py
+++ b/pdfminer/pdfinterp.py
@@ -270,7 +270,7 @@ class PDFContentParser(PSStackParser):
                 self.charpos += 1
                 if len(target) <= i and c.isspace():
                     i += 1
-                elif i < len(target) and c == target[i]:
+                elif i < len(target) and c == (six.int2byte(target[i]) if six.PY3 else target[i]):
                     i += 1
                 else:
                     i = 0