diff --git a/PyPDF2/filters.py b/PyPDF2/filters.py
index 9b3388f8a..44c1b496f 100644
--- a/PyPDF2/filters.py
+++ b/PyPDF2/filters.py
@@ -308,7 +308,7 @@ def decode(data, decodeParms=None):
                         group[2] * (85**2) + \
                         group[3] * 85 + \
                         group[4]
-                    assert b < (2**32 - 1)
+                    assert b <= (2**32 - 1)
                     c4 = chr((b >> 0) % 256)
                     c3 = chr((b >> 8) % 256)
                     c2 = chr((b >> 16) % 256)