diff --git a/.changeset/late-bears-collect.md b/.changeset/late-bears-collect.md
new file mode 100644
index 000000000000..f2bcd193fd7a
--- /dev/null
+++ b/.changeset/late-bears-collect.md
@@ -0,0 +1,5 @@
+---
+"astro": patch
+---
+
+Fixes an issue where `config.vite.build.assetsInlineLimit` could not be set as a function.
diff --git a/packages/astro/src/core/build/plugins/util.ts b/packages/astro/src/core/build/plugins/util.ts
index 7297a1f6f26b..07b18a8870ce 100644
--- a/packages/astro/src/core/build/plugins/util.ts
+++ b/packages/astro/src/core/build/plugins/util.ts
@@ -75,14 +75,13 @@ export function shouldInlineAsset(
 	assetPath: string,
 	assetsInlineLimit: NonNullable<BuildOptions['assetsInlineLimit']>
 ) {
-	if (typeof assetsInlineLimit === 'number') {
-		return Buffer.byteLength(assetContent) < assetsInlineLimit;
-	}
-
-	const result = assetsInlineLimit(assetPath, Buffer.from(assetContent));
-	if (result != null) {
-		return result;
+	if (typeof assetsInlineLimit === 'function') {
+		const result = assetsInlineLimit(assetPath, Buffer.from(assetContent));
+		if (result != null) {
+			return result;
+		} else {
+			return Buffer.byteLength(assetContent) < 4096; // Fallback to 4096kb by default (same as Vite)
+		}
 	}
-
-	return Buffer.byteLength(assetContent) < 4096; // Fallback to 4096kb by default (same as Vite)
+	return Buffer.byteLength(assetContent) < Number(assetsInlineLimit);
 }