diff --git a/nselib/bin.lua b/nselib/bin.lua
index 46e7bff58..36d6608d3 100644
--- a/nselib/bin.lua
+++ b/nselib/bin.lua
@@ -42,8 +42,8 @@
 -- @class module
 -- @name bin
 
-local debug2 = require "stdnse".debug2
-local debug3 = require "stdnse".debug3
+local debug4 = require "stdnse".debug4
+local debug5 = require "stdnse".debug5
 
 local assert = assert
 local error = error
@@ -71,7 +71,7 @@ local function clamp (args, i, j, mask)
         local o = assert(tointeger(args[i]))
         local n = o & mask
         if o ~= n then
-            debug2("bin.pack: clamping arg[%d]: 0x%x -> 0x%x", i, o, n)
+            debug4("bin.pack: clamping arg[%d]: 0x%x -> 0x%x", i, o, n)
         end
         args[i] = n
     end
@@ -90,7 +90,7 @@ end
 -- @param ... The values to pack.
 -- @return String containing packed data.
 function _ENV.pack (format, ...)
-    debug3("bin.pack: format = '%s'", format);
+    debug5("bin.pack: format = '%s'", format);
     format = "!1="..format -- 1 byte alignment
     local endianness = "="
     local i, args = 1, pack(...)
@@ -176,7 +176,7 @@ function _ENV.pack (format, ...)
         end
     end
     format = format:gsub("([%a=<>])(%d*)", translate)
-    debug3("bin.pack: string.pack(format = '%s', ...)", format)
+    debug5("bin.pack: string.pack(format = '%s', ...)", format)
     return format.pack(format, unpack(args)) -- don't use method syntax for better error message
 end
 
@@ -238,7 +238,7 @@ end
 -- @return Position in the data string where unpacking stopped.
 -- @return All unpacked values.
 function _ENV.unpack (format, data, init)
-    debug3("bin.unpack: format = '%s'", format);
+    debug5("bin.unpack: format = '%s'", format);
     format = "!1="..format -- 1 byte alignment
     if type(init) == "number" and init <= 0 then init = 1 end
     local endianness = "="
@@ -300,7 +300,7 @@ function _ENV.unpack (format, data, init)
         end
     end
     format = format:gsub("([%a=<>])(%d*)", translate)
-    debug3("bin.unpack: string.unpack(format = '%s', ...)", format)
+    debug5("bin.unpack: string.unpack(format = '%s', ...)", format)
     return unpacker(fixer, pcall(format.unpack, format, data, init))
 end