diff --git a/global/overlay/etc/puppet/setup_cosmos_modules b/global/overlay/etc/puppet/setup_cosmos_modules
index 62a7d63..f8283d1 100755
--- a/global/overlay/etc/puppet/setup_cosmos_modules
+++ b/global/overlay/etc/puppet/setup_cosmos_modules
@@ -98,31 +98,31 @@ def main():
                 "upgrade": "yes",
                 "tag": "sunet-2*",
             }
-            modules.update[augeas_module]
+            modules.update(augeas_module)
             apt_module = {
                 "repo": "https://github.com/SUNET/puppetlabs-apt.git",
                 "upgrade": "yes",
                 "tag": "sunet-2*",
             }
-            modules.update[apt_module]
+            modules.update(apt_module)
             concat_module = {
                 "repo": "https://github.com/SUNET/puppetlabs-concat.git",
                 "upgrade": "yes",
                 "tag": "sunet-2*",
             }
-            modules.update[concat_module]
+            modules.update(concat_module)
             stdlib_module = {
                 "repo": "https://github.com/SUNET/puppetlabs-stdlib.git",
                 "upgrade": "yes",
                 "tag": "sunet-2*",
             }
-            modules.update[stdlib_module]
+            modules.update(stdlib_module)
             vcsrepo_module = {
                 "repo": "https://github.com/SUNET/puppetlabs-vcsrepo.git",
                 "upgrade": "yes",
                 "tag": "sunet-2*",
             }
-            modules.update[vcsrepo_module]
+            modules.update(vcsrepo_module)
 
         # Make test machines use special test branch of puppet-sunet:
         if OS_INFO["ID"] == "ubuntu":