diff --git a/apache2/re_operators.c b/apache2/re_operators.c
index 1693ed73..2d8c51ef 100644
--- a/apache2/re_operators.c
+++ b/apache2/re_operators.c
@@ -1187,6 +1187,8 @@ static int msre_op_gsbLookup_execute(modsec_rec *msr, msre_rule *rule, msre_var
 
             match_length = strlen(match);
 
+            strtolower_inplace((unsigned char *)match);
+
             if((strstr(match,"http") == NULL) && (match_length > 0) && (strchr(match,'.')))    {
 
                 /* full url */