diff --git a/core/modules/link/src/Plugin/migrate/process/d6/FieldLink.php b/core/modules/link/src/Plugin/migrate/process/d6/FieldLink.php
index 4badcb6..9d06c66 100644
--- a/core/modules/link/src/Plugin/migrate/process/d6/FieldLink.php
+++ b/core/modules/link/src/Plugin/migrate/process/d6/FieldLink.php
@@ -53,6 +53,12 @@ protected function canonicalizeUri($uri) {
       return $uri;
     }
 
+    // If the URL starts with 'www.' without scheme, add 'http://' prefix.
+    if (strpos($uri, 'www.') === 0) {
+      $uri = 'http://' . $uri;
+      return $uri;
+    }
+
     // Remove the <front> component of the URL.
     if (strpos($uri, '<front>') === 0) {
       $uri = substr($uri, strlen('<front>'));