diff --git a/docs/source/conf.py b/docs/source/conf.py
index 68308523..168fc4d9 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -18,7 +18,7 @@
 # On Read the Docs, need to mock any python packages that would require c
 from unittest.mock import MagicMock
 
-MOCK_MODULES = ["mpi4py", "colorama"]
+MOCK_MODULES = ["mpi4py", "colorama", "mpi4py.util.dtlib"]
 sys.modules.update((mod_name, MagicMock()) for mod_name in MOCK_MODULES)