diff --git a/weboob/tools/application/formatters/iformatter.py b/weboob/tools/application/formatters/iformatter.py
index 75c25778..37ea8947 100644
--- a/weboob/tools/application/formatters/iformatter.py
+++ b/weboob/tools/application/formatters/iformatter.py
@@ -85,7 +85,7 @@ class IFormatter(object):
         # XXX if stdin is not a tty, it seems that the command fails.
 
         if os.isatty(sys.stdout.fileno()) and os.isatty(sys.stdin.fileno()):
-            self.termrows = int( subprocess.Popen('stty size', stdout=subprocess.PIPE).communicate()[0].split()[0])
+            self.termrows = int( subprocess.Popen('stty size', shell=True, stdout=subprocess.PIPE).communicate()[0].split()[0])
 
     def after_format(self, formatted):
         if self.outfile != sys.stdout: