diff --git a/src/builder/rollup.ts b/src/builder/rollup.ts
index fd4185d9..4a1dd28d 100644
--- a/src/builder/rollup.ts
+++ b/src/builder/rollup.ts
@@ -260,7 +260,7 @@ export function getRollupOptions(ctx: BuildContext): RollupOptions {
 
     external(id) {
       const pkg = getpkg(id);
-      const isExplicitExternal = arrayIncludes(ctx.options.externals, pkg);
+      const isExplicitExternal = arrayIncludes(ctx.options.externals, pkg) || arrayIncludes(ctx.options.externals, id);
       if (isExplicitExternal) {
         return true;
       }