diff --git a/adi/obs.py b/adi/obs.py
index 7e4204736..9b958399e 100644
--- a/adi/obs.py
+++ b/adi/obs.py
@@ -56,7 +56,7 @@ def __init__(self, ctx, obs_dev, channel_names, complex_data=True):
         self._ctx = ctx
         self._txdac = obs_dev
         self._tx_channel_names = channel_names
-        self._complex_data = complex_data
+        self._tx_complex_data = complex_data
         tx.__init__(self)
 
     def __del__(self):