diff --git a/roles/matrix-cactus-comments/tasks/setup_install.yml b/roles/matrix-cactus-comments/tasks/setup_install.yml
index 765eb9a4f..4a4fce894 100644
--- a/roles/matrix-cactus-comments/tasks/setup_install.yml
+++ b/roles/matrix-cactus-comments/tasks/setup_install.yml
@@ -82,7 +82,7 @@
         src: "/tmp/cactus-comments-{{ matrix_cactus_comments_client_version }}.tar.gz"
         dest: "/tmp/"
         remote_src: true
-        mode: 600
+        mode: 0600
       check_mode: false
 
     - name: Propagate client javascript file