diff --git a/pandora_server/lib/PandoraFMS/Tools.pm b/pandora_server/lib/PandoraFMS/Tools.pm
index 72ec62b501..e0dda9af4f 100755
--- a/pandora_server/lib/PandoraFMS/Tools.pm
+++ b/pandora_server/lib/PandoraFMS/Tools.pm
@@ -26,6 +26,7 @@ use HTML::Entities;
 use Encode;
 use Socket qw(inet_ntoa inet_aton);
 use Sys::Syslog;
+use Scalar::Util qw(looks_like_number);
 
 # New in 3.2. Used to sendmail internally, without external scripts
 # use Module::Loaded;