diff --git a/leep/ca.py b/leep/ca.py
index 02deb0a..cf0852c 100644
--- a/leep/ca.py
+++ b/leep/ca.py
@@ -201,6 +201,7 @@ def wait_for_acq(self, toggle_tag=False, tag=False, timeout=5.0,
 
         while True:
             slow = self._E.Wait(timeout=timeout)
+            slow = slow.astype(int)
             now = datetime.datetime.utcnow()
 
             tag_old = slow[34]