diff --git a/cal_tools/cal_tools/agipdlib.py b/cal_tools/cal_tools/agipdlib.py
index 47198bc147d9c635f91742aee713981551aa8fd5..cd70da6601727d7d1fc7a5b99b78283f93778211 100644
--- a/cal_tools/cal_tools/agipdlib.py
+++ b/cal_tools/cal_tools/agipdlib.py
@@ -125,8 +125,8 @@ class AgipdCorrections:
         # avoid list(range(*[0]]))
         self.pulses_lst = list(range(*max_pulses)) \
             if not (len(max_pulses) == 1 and max_pulses[0] == 0) else max_pulses  #noqa
-        self.min_pulse = self.pulses_lst[0]
-        self.max_pulse = self.pulses_lst[-1]
+        self.min_pulse = int(self.pulses_lst[0])
+        self.max_pulse = int(self.pulses_lst[-1])
         self.max_cells = max_cells
         self.hist_pulses = 0
         self.hists_signal_low = 0
@@ -1048,7 +1048,7 @@ class AgipdCorrections:
 
             # avoid 0 hist_pulses, otherwise histogram plot will fail
             if self.max_pulse == 0:
-                self.hist_pulses = int(self.max_pulse + 1)
+                self.hist_pulses = self.max_pulse + 1
             else:
                 self.hist_pulses = self.max_pulse