diff --git a/turbo_hipster/lib/utils.py b/turbo_hipster/lib/utils.py
index 2abb6d0..67c0e9b 100644
--- a/turbo_hipster/lib/utils.py
+++ b/turbo_hipster/lib/utils.py
@@ -173,8 +173,9 @@ def execute_to_log(cmd, logfile, timeout=-1,
 
     # Clean up
     for fd, descriptor in descriptors.items():
-        p.unregister(fd)
+        poll_obj.unregister(fd)
         fd.close()
+    p.kill()
 
     logger.info('[script exit code = %d]' % p.returncode)