diff --git a/simulations/airshower_beacon_simulation/ab_modify_clocks.py b/simulations/airshower_beacon_simulation/ab_modify_clocks.py
index 608c501..557a638 100755
--- a/simulations/airshower_beacon_simulation/ab_modify_clocks.py
+++ b/simulations/airshower_beacon_simulation/ab_modify_clocks.py
@@ -19,7 +19,7 @@ if __name__ == "__main__":
     from os import path
     import sys
 
-    max_clock_offset = 100 if len(sys.argv) < 2 else int(sys.argv[1]) # ns
+    max_clock_offset = 100 if len(sys.argv) < 2 else float(sys.argv[1]) # ns
     remake_clock_offsets = True
 
     seed = 12345