diff --git a/support/testing/tests/init/test_systemd.py b/support/testing/tests/init/test_systemd.py
index 7bbc112a56..05a65223b3 100644
--- a/support/testing/tests/init/test_systemd.py
+++ b/support/testing/tests/init/test_systemd.py
@@ -198,7 +198,7 @@ class TestInitSystemSystemdRwFull(InitSystemSystemdBase):
 
 
 # The following tests are all about read-only rootfs, and exercise either
-# using an un-populated factory for /var, or an overlaysfs ontop of a
+# using an un-populated factory for /var, or an overlaysfs on top of a
 # pre-populated /var. They all specialise the TestInitSystemSystemdRo*
 # test cases above.