diff --git a/verify.php b/verify.php
index 46ae271..4d72e02 100644
--- a/verify.php
+++ b/verify.php
@@ -22,7 +22,7 @@ class verify
     * Return true or false
     * @param string $val The IP to test
     */
-  public function staticIs_ip ($val)
+  public static function staticIs_ip ($val)
   {
     if (filter_var ($val, FILTER_VALIDATE_IP))
       return true;
@@ -42,7 +42,7 @@ class verify
     * Return true or false
     * @param string $val The IPv4 to test
     */
-  public function staticIs_ipv4 ($val)
+  public static function staticIs_ipv4 ($val)
   {
     if (filter_var ($val, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4))
       return true;
@@ -240,7 +240,7 @@ class verify
     * @param string $val The string to test
     * @param string $allowedChars The allowed chars
     */
-  public function staticIsAllowedChars ($val, $allowedChars)
+  public static function staticIsAllowedChars ($val, $allowedChars)
   {
     preg_match ('/^['.$allowedChars.']+/u', $val, $matches);
     if (isset ($matches[0]) &&