diff --git a/pialert/scanners/arpscan.py b/pialert/scanners/arpscan.py
index 1aefe7ba..142aab78 100755
--- a/pialert/scanners/arpscan.py
+++ b/pialert/scanners/arpscan.py
@@ -14,7 +14,7 @@ def execute_arpscan (userSubnets):
     # scan each interface
     index = 0
     for interface in userSubnets :   
-        write_file (logPath + '/arp_scan_output_', index ,'.txt', arpscan_output)
+        write_file (logPath + '/arp_scan_output_' + index + '.txt', arpscan_output)
         index += 1         
         arpscan_output += execute_arpscan_on_interface (interface)