diff --git a/.vite/build.ts b/.vite/build.ts
index 50b7fb1ad..9d2295322 100644
--- a/.vite/build.ts
+++ b/.vite/build.ts
@@ -127,7 +127,7 @@ const main = async () => {
 };
 
 if (watch) {
-  build(getBuildConfig({ minify: false, watch, core: true, entryName: 'mermaid' }));
+  build(getBuildConfig({ minify: false, watch, core: false, entryName: 'mermaid' }));
   if (!mermaidOnly) {
     build(getBuildConfig({ minify: false, watch, entryName: 'mermaid-mindmap' }));
     // build(getBuildConfig({ minify: false, watch, entryName: 'mermaid-example-diagram' }));