diff --git a/scripts/firewalk.nse b/scripts/firewalk.nse
index 226efcfb2..b6e058e10 100644
--- a/scripts/firewalk.nse
+++ b/scripts/firewalk.nse
@@ -337,6 +337,18 @@ local function setregs(host, ports)
 
 end
 
+--- wrapper for stdnse.parse_timespec() to get specified value in milliseconds
+-- @param spec the time specification string (like "10s", "120ms"...)
+-- @return the equivalent number of milliseconds or nil on failure
+local function parse_timespec_ms(spec)
+  local t = stdnse.parse_timespec(spec)
+  if t then
+    return t * 1000
+  else
+    return nil
+  end
+end
+
 --- set scan parameters using user values if specified or defaults otherwise
 local function getopts()
 
@@ -804,18 +816,6 @@ local function generate_initial_probes(scanner)
   end
 end
 
---- wrapper for stdnse.parse_timespec() to get specified value in milliseconds
--- @param spec the time specification string (like "10s", "120ms"...)
--- @return the equivalent number of milliseconds or nil on failure
-local function parse_timespec_ms(spec)
-  local t = stdnse.parse_timespec(spec)
-  if t then
-    return t * 1000
-  else
-    return nil
-  end
-end
-
 --- firewalk entry point
 action = function(host)
   local saddr = packet.toip(host.bin_ip_src)