diff --git a/scripts/firewalk.nse b/scripts/firewalk.nse
index b6e058e10..ddf359144 100644
--- a/scripts/firewalk.nse
+++ b/scripts/firewalk.nse
@@ -416,7 +416,7 @@ hostrule = function(host)
     nmap.registry['firewalk']['rootfail'] = true
 
     if nmap.verbosity() > 0 then
-      nmap.log_write("stdout", SCRIPT_NAME .. ": not running for lack of privileges")
+      stdnse.print_debug("%s not running for lack of privileges.", SCRIPT_NAME)
     end
 
     return false
@@ -468,7 +468,7 @@ local function initial_ttl(host)
     nmap.registry['firewalk']['traceroutefail'] = true
 
     if nmap.verbosity() > 0 then
-      nmap.log_write("stdout", SCRIPT_NAME .. ": requires unavailable traceroute informations")
+      stdnse.print_debug("%s requires unavailable traceroute informations.", SCRIPT_NAME)
     end
 
     return nil
diff --git a/scripts/ipidseq.nse b/scripts/ipidseq.nse
index 30a2c5d8f..c97272a1f 100644
--- a/scripts/ipidseq.nse
+++ b/scripts/ipidseq.nse
@@ -30,6 +30,7 @@ categories = {"safe", "discovery"}
 
 require 'bin'
 require 'packet'
+require 'stdnse'
 
 local NUMPROBES = 6
 
@@ -193,7 +194,7 @@ hostrule = function(host)
 		end
 		nmap.registry['ipidseq']['rootfail'] = true
 		if nmap.verbosity() > 0 then
-			nmap.log_write("stdout", "IPIDSEQ: not running for lack of privileges")
+			stdnse.print_debug("%s not running for lack of privileges.", SCRIPT_NAME)
 		end
 		return false
 	end
diff --git a/scripts/path-mtu.nse b/scripts/path-mtu.nse
index a107f2378..8687010ad 100644
--- a/scripts/path-mtu.nse
+++ b/scripts/path-mtu.nse
@@ -38,6 +38,7 @@ categories = {"safe", "discovery"}
 
 require 'bin'
 require 'packet'
+require 'stdnse'
 
 local IPPROTO_ICMP = packet.IPPROTO_ICMP
 local IPPROTO_TCP  = packet.IPPROTO_TCP
@@ -274,7 +275,7 @@ hostrule = function(host)
 		end
 		nmap.registry['pathmtu']['rootfail'] = true
 		if nmap.verbosity() > 0 then
-			nmap.log_write("stdout", "PATH-MTU: not running for lack of privileges")
+			stdnse.print_debug("%s not running for lack of privileges.", SCRIPT_NAME)
 		end
 		return false
 	end
diff --git a/scripts/qscan.nse b/scripts/qscan.nse
index e6c80b1f7..950e88d0f 100644
--- a/scripts/qscan.nse
+++ b/scripts/qscan.nse
@@ -374,7 +374,7 @@ hostrule = function(host)
 		end
 		nmap.registry['qscan']['rootfail'] = true
 		if nmap.verbosity() > 0 then
-			nmap.log_write("stdout", "QSCAN: not running for lack of privileges")
+			stdnse.print_debug("%s not running for lack of privileges.", SCRIPT_NAME)
 		end
 		return false
 	end