diff --git a/debian/control b/debian/control
index 068030d..ee8b5af 100644
--- a/debian/control
+++ b/debian/control
@@ -95,7 +95,7 @@ Description: enhances misc security settings
  .
  All mitigations for the MDS vulnerability are enabled.
  .
- DCCP, SCTP, TIPC and RDS are blacklisted as they are rarely used and may have
+ DCCP, SCTP, TIPC, RDS and HDLC are blacklisted as they are rarely used and may have
  unknown vulnerabilities.
  .
  The kernel logs are restricted to root only.
diff --git a/etc/modprobe.d/blacklist-dma.conf b/etc/modprobe.d/blacklist-dma.conf
index 3e2c7de..3a1485b 100644
--- a/etc/modprobe.d/blacklist-dma.conf
+++ b/etc/modprobe.d/blacklist-dma.conf
@@ -1,3 +1,3 @@
 # Blacklist thunderbolt and firewire to prevent some DMA attacks.
-blacklist firewire-core
-blacklist thunderbolt
+install firewire-core /bin/true
+install thunderbolt /bin/true
diff --git a/etc/modprobe.d/uncommon-network-protocols.conf b/etc/modprobe.d/uncommon-network-protocols.conf
index 474598a..41da209 100644
--- a/etc/modprobe.d/uncommon-network-protocols.conf
+++ b/etc/modprobe.d/uncommon-network-protocols.conf
@@ -3,3 +3,4 @@ install dccp /bin/true
 install sctp /bin/true
 install rds /bin/true
 install tipc /bin/true
+install n-hdlc /bin/true