diff --git a/src/Domains/Domain.php b/src/Domains/Domain.php
index fe39e49..245e4e7 100644
--- a/src/Domains/Domain.php
+++ b/src/Domains/Domain.php
@@ -60,7 +60,7 @@ class Domain
      */
     public function __construct(string $domain)
     {
-        if ((strpos($domain, 'http') === 0) || (strpos($domain, 'https') === 0)) {
+        if ((strpos($domain, 'http:') === 0) || (strpos($domain, 'https:') === 0)) {
             throw new Exception('$domain must be a valid domain or hostname');
         }
 
@@ -235,4 +235,4 @@ public function isTest(): bool
 
         return false;
     }
-}
\ No newline at end of file
+}