diff --git a/scripts/SMTPcommands.nse b/scripts/SMTPcommands.nse
index 79b3b59ce..d1c81706a 100644
--- a/scripts/SMTPcommands.nse
+++ b/scripts/SMTPcommands.nse
@@ -80,7 +80,7 @@ action = function(host, port)
     resultEHLO = try(socket:receive_lines(1))
    
     if not (string.match(resultEHLO, "^250")) then
---        stdnse.print_debug("1",resultEHLO)
+--        stdnse.print_debug("1","%s",resultEHLO)
 --        stdnse.print_debug("1","EHLO with errors or timeout.  Enable --script-trace to see what is happening.")
         resultEHLO = ""
     end
@@ -100,7 +100,7 @@ action = function(host, port)
     resultHELP = try(socket:receive_lines(1))
    
     if not (string.match(resultHELP, "^214")) then
---        stdnse.print_debug("1",resultHELP)
+--        stdnse.print_debug("1","%s",resultHELP)
 --        stdnse.print_debug("1","HELP with errors or timeout.  Enable --script-trace to see what is happening.")
         resultHELP = ""
     end
diff --git a/scripts/SQLInject.nse b/scripts/SQLInject.nse
index cb69df09c..ba654d74e 100644
--- a/scripts/SQLInject.nse
+++ b/scripts/SQLInject.nse
@@ -240,8 +240,7 @@ action = function(host, port)
 	end
 
 	if #injectable > 0 then
-		stdnse.print_debug(1, id .. ": Testing " .. #injectable .. 
-                                      " suspicious URLs")
+		stdnse.print_debug(1, "%s: Testing %d suspicious URLs", id, #injectable )
 	end
 
 	-- test all potentially vulnerable queries
diff --git a/scripts/bruteTelnet.nse b/scripts/bruteTelnet.nse
index 61a24a7bb..b4b9ab76d 100644
--- a/scripts/bruteTelnet.nse
+++ b/scripts/bruteTelnet.nse
@@ -65,8 +65,7 @@ local new_auth_iter = function()
 		 end
 
 		i = i + 1
-		stdnse.print_debug(3, id .. " " .. 
-				  userpass[i-1][1] .. ":" .. escape_cred(userpass[i-1][2]))
+		stdnse.print_debug(3, "%s %s:%s", id, userpass[i-1][1], escape_cred(userpass[i-1][2]))
 		return userpass[i-1][1], userpass[i-1][2]
 	end
 end
diff --git a/scripts/showHTMLTitle.nse b/scripts/showHTMLTitle.nse
index db031ffe0..97740b511 100644
--- a/scripts/showHTMLTitle.nse
+++ b/scripts/showHTMLTitle.nse
@@ -37,7 +37,7 @@ action = function(host, port)
 	if data.status == 301 or data.status == 302 then
 		local url = url.parse( data.header.location )
 		if url.host == host.targetname or url.host == ( host.name ~= '' and host.name ) or url.host == host.ip then
-			stdnse.print_debug("showHTMLTitle.nse: Default page is located at " .. url.scheme.. "://" .. url.authority .. url.path)
+			stdnse.print_debug("showHTMLTitle.nse: Default page is located at %s://%s%s", url.scheme, url.authority, url.path)
 			data = http.get( host, port, url.path )
 		end
 	end