diff --git a/lib/plugins/TaskRunner/Script.js b/lib/plugins/TaskRunner/Script.js
index 55daad27..82e52198 100644
--- a/lib/plugins/TaskRunner/Script.js
+++ b/lib/plugins/TaskRunner/Script.js
@@ -36,8 +36,8 @@ module.exports = class Script extends require('./AbstractPlugin') {
       'export PS4=\'\$ \'',
       // Enables command echoing.
       'set -ux',
-      // Default CWD to $SRC_DIR (create it if it it doesn't exist).
-      'mkdir -p $SRC_DIR; cd $SRC_DIR',
+      // Default CWD to $SRC_DIR (remove for cached builds first, then create it if it it doesn't exist).
+      'rm -Rf $SRC_DIR; mkdir -p $SRC_DIR; cd $SRC_DIR',
     ].concat(script);
 
     script = script.join('\n');