--- a/htb.init
+++ b/htb.init
@@ -458,7 +458,7 @@
 	### Load & filter file $HTB_PATH/$1
 	htb_filter_file () {
 		sed -n "s/#.*//; s/[^a-zA-Z0-9.,;:=/*-_]\+//g; \
-		/^[a-zA-Z0-9]\+=[a-zA-Z0-9.,:;/*-_]\+$/ p" $HTB_PATH/$1
+		/^[a-zA-Z0-9_]\+=[a-zA-Z0-9.,:;/*-_]\+$/ p" $HTB_PATH/$1
 	} # htb_filter_file
 
 
@@ -522,7 +522,7 @@
 
 	htb_filter_file () {
 		sed 's/#.*//; s/[^a-zA-Z0-9.,;:=/*-_]\+//g' $HTB_PATH/$1 \
-		| grep '^[a-zA-Z0-9]\+=[a-zA-Z0-9.,;:/*-_]\+$'
+		| grep '^[a-zA-Z0-9_]\+=[a-zA-Z0-9.,;:/*-_]\+$'
 	} # htb_filter_file
 
 	htb_clsid_chain () {