diff --git a/csrf.php b/csrf.php
index 89cb653..d9e7cf3 100644
--- a/csrf.php
+++ b/csrf.php
@@ -164,4 +164,16 @@ class csrf
     return true;
   }
   // }}}
+
+  /** Check an existing token, then delete it
+    * @param string $tokenFromUser The existing token
+    */
+  public function checkThenDeleteToken ($tokenFromUser)
+  // {{{
+  {
+    $this->checkToken ($tokenFromUser);
+    unset ($_SESSION["domframework"]["csrf"][$tokenFromUser]);
+    return true;
+  }
+  // }}}
 }
diff --git a/form.php b/form.php
index b61f18f..ba6d0b4 100644
--- a/form.php
+++ b/form.php
@@ -416,7 +416,9 @@ class form
   {
     $csrf = new csrf ();
     $csrf->field = $this->csrfField;
-    $csrf->checkToken ($tokenFromUser);
+    // The checkThenDeleteToken method check the token and except if there is a
+    // problem. If there is no problem, it delete the token
+    $csrf->checkThenDeleteToken ($tokenFromUser);
   }
   // }}}