diff --git a/plugins/xenserver/networking/etc/xensource/scripts/ovs_configure_vif_flows.py b/plugins/xenserver/networking/etc/xensource/scripts/ovs_configure_vif_flows.py
old mode 100755
new mode 100644
index 58c33cc0e9..ac1e3e27c4
--- a/plugins/xenserver/networking/etc/xensource/scripts/ovs_configure_vif_flows.py
+++ b/plugins/xenserver/networking/etc/xensource/scripts/ovs_configure_vif_flows.py
@@ -227,8 +227,8 @@ def apply_ovs_ipv6_flows(ovs, bridge, params):
 
 if __name__ == "__main__":
     if len(sys.argv) != 4:
-        print ("usage: %s [online|offline] vif-domid-idx [ipv4|ipv6|all] " %
-               os.path.basename(sys.argv[0]))
+        print("usage: %s [online|offline] vif-domid-idx [ipv4|ipv6|all] " %
+              os.path.basename(sys.argv[0]))
         sys.exit(1)
     else:
         command, vif_raw, net_type = sys.argv[1:4]
diff --git a/plugins/xenserver/networking/etc/xensource/scripts/vif_rules.py b/plugins/xenserver/networking/etc/xensource/scripts/vif_rules.py
old mode 100755
new mode 100644
index b13c624ec1..93f38d39d7
--- a/plugins/xenserver/networking/etc/xensource/scripts/vif_rules.py
+++ b/plugins/xenserver/networking/etc/xensource/scripts/vif_rules.py
@@ -123,8 +123,8 @@ def apply_ebtables_rules(command, params):
 
 if __name__ == "__main__":
     if len(sys.argv) < 3:
-        print ("usage: %s dom_id online|offline [vif]" %
-               os.path.basename(sys.argv[0]))
+        print("usage: %s dom_id online|offline [vif]" %
+              os.path.basename(sys.argv[0]))
         sys.exit(1)
     else:
         dom_id, command = sys.argv[1:3]
diff --git a/tools/regression_tester.py b/tools/regression_tester.py
old mode 100755
new mode 100644
index fb7694729c..0dce224b01
--- a/tools/regression_tester.py
+++ b/tools/regression_tester.py
@@ -62,8 +62,8 @@ def main():
         original_branch = run("git rev-parse --abbrev-ref HEAD")
         run("git review -d %s" % options.review)
     else:
-        print ("no gerrit review number specified, running on latest commit"
-               "on current branch.")
+        print("no gerrit review number specified, running on latest commit"
+              "on current branch.")
 
     test_works = False