diff --git a/pym/cl_fill_builder.py b/pym/cl_fill_builder.py
index ee73f33..f7d7ca6 100644
--- a/pym/cl_fill_builder.py
+++ b/pym/cl_fill_builder.py
@@ -120,7 +120,7 @@ class fillVars(object, glob_attr):
         else:
             return cacheDir
 
-    reChroot = re.compile("^_=.*bin/chroot$",re.S)
+    reChroot = re.compile("^(?:_=.*bin/chroot|CHROOT=on)$",re.S)
 
     def isChroot(self,pid):
         """Recursive detect chroot mode"""