diff --git a/packages/astro/src/@types/astro.ts b/packages/astro/src/@types/astro.ts
index 6c35bbe221db3..cd2c086ae606e 100644
--- a/packages/astro/src/@types/astro.ts
+++ b/packages/astro/src/@types/astro.ts
@@ -933,7 +933,6 @@ export interface AstroIntegration {
 			command: 'dev' | 'build';
 			updateConfig: (newConfig: Record<string, any>) => void;
 			addRenderer: (renderer: AstroRenderer) => void;
-			addPageExtensions: (extensions: string|string[]) => void;
 			injectScript: (stage: InjectedScriptStage, content: string) => void;
 			injectRoute: (injectRoute: InjectedRoute) => void;
 			// TODO: Add support for `injectElement()` for full HTML element injection, not just scripts.