diff --git a/dawn-client/testing b/dawn-client/testing
index 8b4518db2c7cdb62a16b46c1ca4ff3b18bde10d3..dc1be02a553e2ef78f52262969cefe84516d3aeb 100644
--- a/dawn-client/testing
+++ b/dawn-client/testing
@@ -20,6 +20,7 @@ pipeline {
     stage('copy build') {
         steps {
             sh '''
+                sudo rm -rf /var/www/dawn_test/build
                 sudo cp build /var/www/dawn_test
             '''
         }