diff --git a/docs/en_us/developers/source/conf.py b/docs/en_us/developers/source/conf.py
index b836041ec9..41576c141c 100644
--- a/docs/en_us/developers/source/conf.py
+++ b/docs/en_us/developers/source/conf.py
@@ -43,6 +43,7 @@ sys.path.append(root / "common/lib/capa")
 sys.path.append(root / "common/lib/chem")
 sys.path.append(root / "common/lib/sandbox-packages")
 sys.path.append(root / "common/lib/xmodule")
+sys.path.append(root / "common/lib/opaque_keys")
 sys.path.append(root / "lms/djangoapps")
 sys.path.append(root / "lms/lib")
 sys.path.append(root / "cms/djangoapps")