diff --git a/.changeset/clever-nails-pump.md b/.changeset/clever-nails-pump.md
new file mode 100644
index 000000000000..e363c78f5524
--- /dev/null
+++ b/.changeset/clever-nails-pump.md
@@ -0,0 +1,5 @@
+---
+'astro': patch
+---
+
+Fixes use of @fontsource packages
diff --git a/packages/astro/src/core/create-vite.ts b/packages/astro/src/core/create-vite.ts
index 0855112ea600..7b3a8070f72b 100644
--- a/packages/astro/src/core/create-vite.ts
+++ b/packages/astro/src/core/create-vite.ts
@@ -34,6 +34,8 @@ const ALWAYS_NOEXTERNAL = new Set([
 	// Handle recommended nanostores. Only @nanostores/preact is required from our testing!
 	// Full explanation and related bug report: https://github.com/withastro/astro/pull/3667
 	'@nanostores/preact',
+	// fontsource packages are CSS that need to be processed
+	'@fontsource/*',
 ]);
 
 function getSsrNoExternalDeps(projectRoot: URL): string[] {