diff --git a/src/Schema/EnumSchema.php b/src/Schema/EnumSchema.php
index f97a130a5..f516b2488 100644
--- a/src/Schema/EnumSchema.php
+++ b/src/Schema/EnumSchema.php
@@ -29,11 +29,25 @@ public function toArray(): array
     {
         return [
             'description' => $this->description,
-            'enum' => $this->options,
+            'enum' => $this->options(),
             'type' => $this->types(),
         ];
     }
 
+    /**
+     * @return array
+     */
+    protected function options(): array
+    {
+        $options = $this->options;
+
+        if ($this->nullable) {
+            $options[] = null;
+        }
+
+        return $options;
+    }
+
     /**
      * @return string[]|string
      */