diff --git a/units/ADC.py b/units/ADC.py
index d8868d7..bb27497 100644
--- a/units/ADC.py
+++ b/units/ADC.py
@@ -361,7 +361,7 @@ class ADC(gex.Unit):
     def capture_in_progress(self):
         return self._stream_running or self._trig_buf is not None
 
-    def capture(self, count, timeout=None, async=False, lst=None):
+    def capture(self, count, timeout=None, asynch=False, lst=None):
         """
         Start a block capture.
         This is similar to a forced trigger, but has custom size and doesn't include any pre-trigger.
@@ -400,7 +400,7 @@ class ADC(gex.Unit):
 
             if frame.type == EVT_CAPT_DONE:
                 self._bcap_done = True
-                if async:
+                if asynch:
                     lst(self._parse_buffer(buffer))
                     self._stream_running = False
                 return TF.CLOSE
@@ -409,7 +409,7 @@ class ADC(gex.Unit):
 
         self._query_async(cmd=CMD_BLOCK_CAPTURE, pld=pb.close(), callback=_lst)
 
-        if not async:
+        if not asynch:
             # wait with a timeout
             self.client.transport.poll(timeout, lambda: self._bcap_done == True)