1 files changed, 3 insertions, 1 deletions

diff --git a/bitbake/lib/bb/cooker.py b/bitbake/lib/bb/cooker.py
index fb38289397..a2b0bb5d7d 100644
--- a/bitbake/lib/bb/cooker.py
+++ b/bitbake/lib/bb/cooker.py
@@ -527,9 +527,11 @@ class BBCooker:
         self.handleCollections( self.data.getVar("BBFILE_COLLECTIONS", True) )
 
     def updateConfigOpts(self, options, environment):
+        clean = True
         for o in options:
+            if o in ['prefile', 'postfile']:
+                clean = False
             setattr(self.configuration, o, options[o])
-        clean = True
         for k in bb.utils.approved_variables():
             if k in environment and k not in self.configuration.env:
                 logger.debug(1, "Updating environment variable %s to %s" % (k, environment[k]))