diff --git a/modules/ing/pages/login.py b/modules/ing/pages/login.py
index bce00c33..bb332632 100644
--- a/modules/ing/pages/login.py
+++ b/modules/ing/pages/login.py
@@ -66,9 +66,6 @@ class INGVirtKeyboard(VirtKeyboard):
 
         VirtKeyboard.__init__(self, basepage.browser.openurl(url), coords, self.color)
 
-        if basepage.browser.responses_dirname is None:
-            basepage.browser.responses_dirname = \
-                    tempfile.mkdtemp(prefix='weboob_session_')
         self.check_symbols(self.symbols, basepage.browser.responses_dirname)
 
     def get_string_code(self, string):
diff --git a/weboob/tools/captcha/virtkeyboard.py b/weboob/tools/captcha/virtkeyboard.py
index d8eaf148..199b927e 100644
--- a/weboob/tools/captcha/virtkeyboard.py
+++ b/weboob/tools/captcha/virtkeyboard.py
@@ -119,6 +119,8 @@ class VirtKeyboard(object):
             try:
                 self.get_symbol_code(symbols[s])
             except VirtKeyboardError:
+                if dirname is None:
+                    dirname = tempfile.mkdtemp(prefix='weboob_session_')
                 self.generate_MD5(dirname)
                 raise VirtKeyboardError("Symbol '%s' not found; all symbol hashes are available in %s"\
                                         % (s, dirname))