diff --git a/view/theme/darkzero/theme.php b/view/theme/darkzero/theme.php
index 338f40cbf..5d63583f4 100644
--- a/view/theme/darkzero/theme.php
+++ b/view/theme/darkzero/theme.php
@@ -2,3 +2,48 @@
$a->theme_info = array(
'extends' => 'duepuntozero',
);
+
+$a->page['htmlhead'] .= <<< EOT
+
+EOT;
diff --git a/view/theme/greenzero/theme.php b/view/theme/greenzero/theme.php
index 338f40cbf..5d63583f4 100644
--- a/view/theme/greenzero/theme.php
+++ b/view/theme/greenzero/theme.php
@@ -2,3 +2,48 @@
$a->theme_info = array(
'extends' => 'duepuntozero',
);
+
+$a->page['htmlhead'] .= <<< EOT
+
+EOT;
diff --git a/view/theme/purplezero/theme.php b/view/theme/purplezero/theme.php
index 338f40cbf..5d63583f4 100644
--- a/view/theme/purplezero/theme.php
+++ b/view/theme/purplezero/theme.php
@@ -2,3 +2,48 @@
$a->theme_info = array(
'extends' => 'duepuntozero',
);
+
+$a->page['htmlhead'] .= <<< EOT
+
+EOT;