diff --git a/themes/danbooru/view.theme.php b/themes/danbooru/view.theme.php
index 43c4332f..41127900 100644
--- a/themes/danbooru/view.theme.php
+++ b/themes/danbooru/view.theme.php
@@ -43,10 +43,7 @@ class CustomViewPostTheme extends ViewPostTheme
         }
 
         if (!is_null($image->source)) {
-            $h_source = html_escape($image->source);
-            if (substr($image->source, 0, 7) != "http://" && substr($image->source, 0, 8) != "https://") {
-                $h_source = "http://" . $h_source;
-            }
+            $h_source = html_escape(make_http($image->source));
             $html .= "<br>Source: <a href='$h_source'>link</a>";
         }
 
diff --git a/themes/danbooru2/view.theme.php b/themes/danbooru2/view.theme.php
index e795b42f..0c3726ee 100644
--- a/themes/danbooru2/view.theme.php
+++ b/themes/danbooru2/view.theme.php
@@ -44,10 +44,7 @@ class CustomViewPostTheme extends ViewPostTheme
 
 
         if (!is_null($image->source)) {
-            $h_source = html_escape($image->source);
-            if (substr($image->source, 0, 7) != "http://" && substr($image->source, 0, 8) != "https://") {
-                $h_source = "http://" . $h_source;
-            }
+            $h_source = html_escape(make_http($image->source));
             $html .= "<br>Source: <a href='$h_source'>link</a>";
         }
 
diff --git a/themes/lite/view.theme.php b/themes/lite/view.theme.php
index aecae4dd..7163a9b2 100644
--- a/themes/lite/view.theme.php
+++ b/themes/lite/view.theme.php
@@ -48,10 +48,7 @@ class CustomViewPostTheme extends ViewPostTheme
 
 
         if (!is_null($image->source)) {
-            $h_source = html_escape($image->source);
-            if (substr($image->source, 0, 7) != "http://" && substr($image->source, 0, 8) != "https://") {
-                $h_source = "http://" . $h_source;
-            }
+            $h_source = html_escape(make_http($image->source));
             $html .= "<br>Source: <a href='$h_source'>link</a>";
         }