diff --git a/CHANGES b/CHANGES
index abae2eb87e..2ffc4a7614 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,6 @@
+4878.	[bug]		List 'ply' as a requirement for the 'isc' python
+			package. [RT #47065]
+
 	--- 9.10.7b1 released ---
 
 4876.	[bug]		Address deadlock with accessing a keytable. [RT #47000]
diff --git a/bin/python/setup.py b/bin/python/setup.py
index c7759c289c..cd0b7070d3 100644
--- a/bin/python/setup.py
+++ b/bin/python/setup.py
@@ -22,4 +22,5 @@ setup(name='isc',
       author='Internet Systems Consortium, Inc',
       author_email='bind9-bugs@isc.org',
       license='ISC',
+      requires=['ply'],
       packages=['isc'])