diff --git a/tox.ini b/tox.ini
index a6070bd5d..504963d4a 100644
--- a/tox.ini
+++ b/tox.ini
@@ -10,6 +10,7 @@ requires =
 	wheel
 	setuptools_scm
 [testenv]
+package = editable  # without this it does not find setup_docs when running under fakeroot
 setenv =
    fuse2: BORG_FUSE_IMPL=llfuse
    fuse3: BORG_FUSE_IMPL=pyfuse3