diff --git a/filebeat/tests/system/test_input.py b/filebeat/tests/system/test_input.py
index b3b832c451ce..8aebe49f4d0a 100644
--- a/filebeat/tests/system/test_input.py
+++ b/filebeat/tests/system/test_input.py
@@ -719,7 +719,7 @@ def test_inode_marker_based_identity_tracking(self):
         File is picked up again if the contents of the marker file changes.
         """
 
-        marker_location = self.working_dir + "/marker"
+        marker_location = os.path.join(self.working_dir, "marker")
         with open(marker_location, 'w') as m:
             m.write("very-unique-string")
 
@@ -753,7 +753,7 @@ def test_inode_marker_based_identity_tracking_to_path_based(self):
         File reading can be continued after file_identity is changed.
         """
 
-        marker_location = self.working_dir + "/marker"
+        marker_location = os.path.join(self.working_dir, "marker")
         with open(marker_location, 'w') as m:
             m.write("very-unique-string")