diff --git a/schainpy/model/proc/jroproc_parameters.py b/schainpy/model/proc/jroproc_parameters.py
index 484a8b6..9ca3b35 100644
--- a/schainpy/model/proc/jroproc_parameters.py
+++ b/schainpy/model/proc/jroproc_parameters.py
@@ -2032,7 +2032,7 @@ class SMDetection(Operation):
             timeLag = 45*10**-3
         else:
             timeLag = 15*10**-3
-        lag = numpy.ceil(timeLag/timeInterval)
+        lag = int(numpy.ceil(timeLag/timeInterval))
 
         listMeteors1 = []