diff --git a/packages/astro/src/core/dev/index.ts b/packages/astro/src/core/dev/index.ts
index a128fa1ecd..b45c4491aa 100644
--- a/packages/astro/src/core/dev/index.ts
+++ b/packages/astro/src/core/dev/index.ts
@@ -151,7 +151,6 @@ export class AstroDevServer {
           info(this.logging, 'astro', msg.devHost({ host: `http://${this.hostname}:${this.port}` }));
           resolve();
         });
-        this.httpServer?.on('error', onError);
       };
 
       const onError = (err: NodeJS.ErrnoException) => {
@@ -170,6 +169,7 @@ export class AstroDevServer {
       };
 
       listen();
+      this.httpServer?.on('error', onError);
     });
   }
 
diff --git a/packages/astro/src/runtime/server/index.ts b/packages/astro/src/runtime/server/index.ts
index 7a41ef7ab0..6e56a336e6 100644
--- a/packages/astro/src/runtime/server/index.ts
+++ b/packages/astro/src/runtime/server/index.ts
@@ -365,13 +365,17 @@ export async function renderToString(result: SSRResult, componentFactory: AstroC
 const uniqueElements = (item: any, index: number, all: any[]) => {
   const props = JSON.stringify(item.props);
   const children = item.children;
-  return index === all.findIndex(i => JSON.stringify(i.props) === props && i.children == children)
-}
+  return index === all.findIndex((i) => JSON.stringify(i.props) === props && i.children == children);
+};
 
 export async function renderPage(result: SSRResult, Component: AstroComponentFactory, props: any, children: any) {
   const template = await renderToString(result, Component, props, children);
-  const styles = Array.from(result.styles).filter(uniqueElements).map((style) => renderElement('style', style));
-  const scripts = Array.from(result.scripts).filter(uniqueElements).map((script) => renderElement('script', script));
+  const styles = Array.from(result.styles)
+    .filter(uniqueElements)
+    .map((style) => renderElement('style', style));
+  const scripts = Array.from(result.scripts)
+    .filter(uniqueElements)
+    .map((script) => renderElement('script', script));
   return template.replace('</head>', styles.join('\n') + scripts.join('\n') + '</head>');
 }