diff --git a/doc/manual/conf.py b/doc/manual/conf.py
index af1f56e82..33032b259 100644
--- a/doc/manual/conf.py
+++ b/doc/manual/conf.py
@@ -35,7 +35,7 @@ mock_modules = ["artiq.gui.waitingspinnerwidget",
                 "artiq.compiler.module",
                 "artiq.compiler.embedding",
                 "artiq.dashboard.waveform",
-                "qasync", "pyqtgraph", "matplotlib",
+                "qasync", "pyqtgraph", "matplotlib", "lmdb",
                 "numpy", "dateutil", "dateutil.parser", "prettytable", "PyQt5",
                 "h5py", "serial", "scipy", "scipy.interpolate",
                 "llvmlite", "Levenshtein", "pythonparser",