diff --git a/trytond/config.py b/trytond/config.py
index c3cefeb5fb..0b50a5b70a 100644
--- a/trytond/config.py
+++ b/trytond/config.py
@@ -105,6 +105,11 @@ class TrytonConfigParser(configparser.RawConfigParser):
         configfile = [os.path.expanduser(filename) for filename in configfile]
         read_files = self.read(configfile)
         logger.info('using %s as configuration files', ', '.join(read_files))
+        configfile = set(configfile)
+        read_files = set(read_files)
+        if configfile != read_files:
+            logger.error('could not load %s',
+                ','.join(configfile - read_files))
 
     def get(self, section, option, *args, **kwargs):
         default = kwargs.pop('default', None)