diff --git a/src/Illuminate/Database/Schema/ForeignKeyDefinition.php b/src/Illuminate/Database/Schema/ForeignKeyDefinition.php
index 6682da30c81b..1ce0361b9377 100644
--- a/src/Illuminate/Database/Schema/ForeignKeyDefinition.php
+++ b/src/Illuminate/Database/Schema/ForeignKeyDefinition.php
@@ -34,6 +34,16 @@ public function restrictOnUpdate()
         return $this->onUpdate('restrict');
     }
 
+    /**
+     * Indicate that updates should set the foreign key value to null.
+     *
+     * @return $this
+     */
+    public function nullOnUpdate()
+    {
+        return $this->onUpdate('set null');
+    }
+
     /**
      * Indicate that updates should have "no action".
      *