diff --git a/build/build-docs.js b/build/build-docs.js
index ea95a50..7c3cc28 100644
--- a/build/build-docs.js
+++ b/build/build-docs.js
@@ -3,6 +3,7 @@ const shell = require('shelljs');
 
 shell.exec('gitbook build', (code, stdout, stderr) => {
   if( code === 0 ) {
+    shell.rm('-rf', 'site/docs');
     shell.exec('mv _book site/docs')
   }
 });
\ No newline at end of file