diff --git a/config/cfgroot/ids-functions.pl b/config/cfgroot/ids-functions.pl
index 3e146b589..a71305b98 100644
--- a/config/cfgroot/ids-functions.pl
+++ b/config/cfgroot/ids-functions.pl
@@ -21,6 +21,8 @@
 #                                                                          #
 ############################################################################
 
+use strict;
+
 package IDS;
 
 require '/var/ipfire/general-functions.pl';