diff --git a/src/cpymad/madx.py b/src/cpymad/madx.py
index 6b56723e..5382f173 100644
--- a/src/cpymad/madx.py
+++ b/src/cpymad/madx.py
@@ -196,7 +196,7 @@ def __init__(self, libmadx=None, command_log=None, stdout=None,
                 if callable(stdout):
                     try:
                         stdout(b'')
-                    except TypeError:
+                    except (TypeError, ValueError):
                         stdout = TextCallback(stdout)
             Popen_args['stdout'] = \
                 subprocess.PIPE if callable(stdout) else stdout