diff --git a/packages/gatsby/index.d.ts b/packages/gatsby/index.d.ts
index 5b3fb4ea9c6da..29e6e7cc92047 100644
--- a/packages/gatsby/index.d.ts
+++ b/packages/gatsby/index.d.ts
@@ -824,7 +824,7 @@ export interface GatsbySSR<
 }
 
 export interface PluginOptions {
-  plugins: unknown[]
+  plugins?: unknown[]
   [key: string]: unknown
 }