diff --git a/config/buildroot/configs/airgap_librem13v4_defconfig b/config/buildroot/configs/airgap_librem13v4_defconfig
index 9dee9d9..dbfee3c 100644
--- a/config/buildroot/configs/airgap_librem13v4_defconfig
+++ b/config/buildroot/configs/airgap_librem13v4_defconfig
@@ -120,7 +120,7 @@ BR2_OPTIMIZE_S=y
 BR2_SHARED_LIBS=y
 # BR2_SHARED_STATIC_LIBS is not set
 BR2_PACKAGE_OVERRIDE_FILE="$(CONFIG_DIR)/local.mk"
-BR2_GLOBAL_PATCH_DIR=""
+BR2_GLOBAL_PATCH_DIR="$(BR2_EXTERNAL_Airgap_PATH)/patches/"
 
 #
 # Advanced
diff --git a/config/buildroot/patches/deterministic-iso9660.patch b/config/buildroot/patches/deterministic-iso9660.patch
new file mode 100644
index 0000000..fed8b61
--- /dev/null
+++ b/config/buildroot/patches/deterministic-iso9660.patch
@@ -0,0 +1,12 @@
+diff --git a/fs/iso9660/iso9660.mk b/fs/iso9660/iso9660.mk
+index a129655ce3..6db691ed2c 100644
+--- a/fs/iso9660/iso9660.mk
++++ b/fs/iso9660/iso9660.mk
+@@ -129,6 +129,7 @@ ROOTFS_ISO9660_PRE_GEN_HOOKS += ROOTFS_ISO9660_DISABLE_EXTERNAL_INITRD
+ endif # ROOTFS_ISO9660_USE_INITRD
+ 
+ define ROOTFS_ISO9660_CMD
++LD_PRELOAD=/usr/lib/x86_64-linux-gnu/faketime/libfaketime.so.1 \
+ 	$(HOST_DIR)/bin/genisoimage -J -R -b $(ROOTFS_ISO9660_BOOT_IMAGE) \
+ 		-no-emul-boot -boot-load-size 4 -boot-info-table \
+ 		$(ROOTFS_ISO9660_GENISOIMAGE_OPTS) \
diff --git a/scripts/environment b/scripts/environment
index f4581a9..8fb54ef 100755
--- a/scripts/environment
+++ b/scripts/environment
@@ -12,5 +12,4 @@ export BUILDROOT_REPO=git://git.busybox.net/buildroot
 export HEADS_REPO=https://source.puri.sm/coreboot/purism-heads.git
 export FAKETIME="@${GIT_DATETIME?}"
 export SOURCE_DATE_EPOCH="${GIT_EPOCH?}"
-export LD_PRELOAD=/usr/lib/x86_64-linux-gnu/faketime/libfaketime.so.1
 export ROOTFS_ISO9660_GENISOIMAGE_OPTS="-creation-date=${GIT_EPOCH} "
diff --git a/scripts/fetch b/scripts/fetch
index 1fe40ba..d8549fb 100755
--- a/scripts/fetch
+++ b/scripts/fetch
@@ -20,6 +20,11 @@ mkdir -p "$build_dir"
 	|| git clone "$buildroot_repo" "$buildroot_dir"
 git -C "$buildroot_dir" checkout "$buildroot_ref"
 cd "$buildroot_dir"
+git reset --hard
+for patch in ${BR2_EXTERNAL}/patches/*; do
+	echo "Applying patch: ${patch}"
+	patch -p1 --no-backup-if-mismatch < "${patch}"
+done
 make "airgap_${TARGET}_defconfig"
 make source