diff --git a/extensions/Example/template/en/default/setup/strings.txt.pl b/extensions/Example/template/en/default/setup/strings.txt.pl
index 6ee4b5fdcc..d703aae8d4 100644
--- a/extensions/Example/template/en/default/setup/strings.txt.pl
+++ b/extensions/Example/template/en/default/setup/strings.txt.pl
@@ -17,6 +17,10 @@
 # Contributor(s):
 #   Max Kanat-Alexander <mkanat@bugzilla.org>
 
+use 5.10.1;
+use strict;
+use warnings;
+
 %strings = (feature_example_acme => 'Example Extension: Acme Feature',);
 
 1;
diff --git a/extensions/OldBugMove/Config.pm b/extensions/OldBugMove/Config.pm
index e401260469..6e434bf203 100644
--- a/extensions/OldBugMove/Config.pm
+++ b/extensions/OldBugMove/Config.pm
@@ -20,6 +20,10 @@
 #   Max Kanat-Alexander <mkanat@bugzilla.org>
 
 package Bugzilla::Extension::OldBugMove;
+
+use 5.10.1;
 use strict;
+use warnings;
+
 use constant NAME => 'OldBugMove';
 __PACKAGE__->NAME;
diff --git a/extensions/OldBugMove/Extension.pm b/extensions/OldBugMove/Extension.pm
index aa3d1aab0e..a54789d485 100644
--- a/extensions/OldBugMove/Extension.pm
+++ b/extensions/OldBugMove/Extension.pm
@@ -20,7 +20,11 @@
 #   Max Kanat-Alexander <mkanat@bugzilla.org>
 
 package Bugzilla::Extension::OldBugMove;
+
+use 5.10.1;
 use strict;
+use warnings;
+
 use base qw(Bugzilla::Extension);
 use Bugzilla::Constants;
 use Bugzilla::Error;
diff --git a/extensions/OldBugMove/lib/Params.pm b/extensions/OldBugMove/lib/Params.pm
index cea3fecf66..43db99358e 100644
--- a/extensions/OldBugMove/lib/Params.pm
+++ b/extensions/OldBugMove/lib/Params.pm
@@ -31,7 +31,9 @@
 
 package Bugzilla::Extension::OldBugMove::Params;
 
+use 5.10.1;
 use strict;
+use warnings;
 
 use Bugzilla::Config::Common;
 
diff --git a/extensions/ShadowBugs/Config.pm b/extensions/ShadowBugs/Config.pm
index a45948dd4a..6efa5fc165 100644
--- a/extensions/ShadowBugs/Config.pm
+++ b/extensions/ShadowBugs/Config.pm
@@ -6,7 +6,10 @@
 # defined by the Mozilla Public License, v. 2.0.
 
 package Bugzilla::Extension::ShadowBugs;
+
+use 5.10.1;
 use strict;
+use warnings;
 
 use constant NAME             => 'ShadowBugs';
 use constant REQUIRED_MODULES => [];
diff --git a/extensions/ShadowBugs/Extension.pm b/extensions/ShadowBugs/Extension.pm
index a1eb4a8c10..07288e9e1f 100644
--- a/extensions/ShadowBugs/Extension.pm
+++ b/extensions/ShadowBugs/Extension.pm
@@ -7,7 +7,9 @@
 
 package Bugzilla::Extension::ShadowBugs;
 
+use 5.10.1;
 use strict;
+use warnings;
 
 use base qw(Bugzilla::Extension);