diff --git a/.changeset/light-falcons-battle.md b/.changeset/light-falcons-battle.md
new file mode 100644
index 000000000000..14059d8337e4
--- /dev/null
+++ b/.changeset/light-falcons-battle.md
@@ -0,0 +1,5 @@
+---
+"create-astro": patch
+---
+
+Fixes a case where a promise wasn't awaited, causing an issue in Deno.
diff --git a/packages/create-astro/src/actions/template.ts b/packages/create-astro/src/actions/template.ts
index e5cf22e50b95..3afd5f3cf47a 100644
--- a/packages/create-astro/src/actions/template.ts
+++ b/packages/create-astro/src/actions/template.ts
@@ -59,7 +59,7 @@ const FILES_TO_UPDATE = {
 		fs.promises.readFile(file, 'utf-8').then((value) => {
 			// Match first indent in the file or fallback to `\t`
 			const indent = /(^\s+)/m.exec(value)?.[1] ?? '\t';
-			fs.promises.writeFile(
+			return fs.promises.writeFile(
 				file,
 				JSON.stringify(
 					Object.assign(JSON.parse(value), Object.assign(overrides, { private: undefined })),