diff --git a/weboob/tools/application/base.py b/weboob/tools/application/base.py
index 08d0ed9c..2fee83e0 100644
--- a/weboob/tools/application/base.py
+++ b/weboob/tools/application/base.py
@@ -24,8 +24,9 @@ from optparse import OptionGroup, OptionParser
 import os
 import sys
 import tempfile
+import warnings
 
-from weboob.capabilities.base import NotAvailable, NotLoaded
+from weboob.capabilities.base import NotAvailable, NotLoaded, ConversionWarning
 from weboob.core import Weboob, CallErrors
 from weboob.core.backendscfg import BackendsConfig
 from weboob.tools.config.iconfig import ConfigError
@@ -304,6 +305,10 @@ class BaseApplication(object):
         else:
             level = logging.WARNING
 
+        # this only matters to developers
+        if not self.options.debug and not self.options.save_responses:
+            warnings.simplefilter('ignore', category=ConversionWarning)
+
         handlers = []
 
         if self.options.save_responses: