diff --git a/numbers/search-available.php b/numbers/search-available.php
index 3098479..252ead9 100644
--- a/numbers/search-available.php
+++ b/numbers/search-available.php
@@ -10,7 +10,7 @@
 
 /** @var IterableAPICollection $response */
 $filter = new AvailableNumbers([
-    "pattern" => (int) NUMBER_SEARCH_CRITERIA,
+    "pattern" => (string) NUMBER_SEARCH_CRITERIA,
     "search_pattern" => (int) NUMBER_SEARCH_PATTERN,
     "type" => VONAGE_NUMBER_TYPE,
     "features" => VONAGE_NUMBER_FEATURES,
@@ -21,4 +21,4 @@
 
 foreach ($response as $number) {
     echo "Tel: " . $number->getMsisdn() . " Cost: " . $number->getCost() . "\n";
-}
\ No newline at end of file
+}