diff --git a/ulog_parser.pl b/ulog_parser.pl
index e4c04941..bae015d8 100755
--- a/ulog_parser.pl
+++ b/ulog_parser.pl
@@ -3,11 +3,13 @@ use 5.014;
 use strict;
 use warnings;
 use JSON;
-use YAML;
+use YAML::Syck;
 use File::Spec;
 use Cwd 'abs_path';
 use Data::Dumper;
 
+local $YAML::Syck::SingleQuote = 1 ;
+
 my $filename = "/var/log/ngcp/kamailio-proxy.log";
 my $output_dir = "log";
 my $path;
@@ -31,7 +33,7 @@ sub save_data
   {
     if (!$data->{'sip_out'}) { print "no sip_out\n"; }
     $path = File::Spec->catfile( $output_dir, (sprintf "%04i", $data->{'msgid'}).".yml");
-    YAML::DumpFile($path, $data);
+    YAML::Syck::DumpFile($path, $data);
     #print "$data->{'msgid'} saved\n";
   }
   $data = {