diff --git a/ohmpi/ohmpi.py b/ohmpi/ohmpi.py
index e67269a3075932445d68e4455690df52db8a5510..5f3b6d5d136cf7e06f4ebeef014c0ddabcd87239 100644
--- a/ohmpi/ohmpi.py
+++ b/ohmpi/ohmpi.py
@@ -190,7 +190,7 @@ class OhmPi(object):
                     f.write('A,B,M,N,t,pulse,polarity,current,voltage\n')
             # write full data
             with open(fw_filename, 'a') as f:
-                dd = last_measurement['fulldata']
+                dd = last_measurement['full_waveform']
                 aa = np.repeat(last_measurement['A'], dd.shape[0])
                 bb = np.repeat(last_measurement['B'], dd.shape[0])
                 mm = np.repeat(last_measurement['M'], dd.shape[0])