diff --git a/main/postmarketos-mkinitfs/APKBUILD b/main/postmarketos-mkinitfs/APKBUILD
index 4eba32a42..b6a1ebf6f 100644
--- a/main/postmarketos-mkinitfs/APKBUILD
+++ b/main/postmarketos-mkinitfs/APKBUILD
@@ -2,7 +2,7 @@
 # Co-Maintainer: Clayton Craft <clayton@craftyguy.net>
 pkgname=postmarketos-mkinitfs
 pkgver=1.5.1
-pkgrel=2
+pkgrel=3
 pkgdesc="Tool to generate initramfs images for postmarketOS"
 url="https://postmarketos.org"
 depends="
@@ -68,5 +68,5 @@ sha512sums="
 d28802b17d7912a58d23c02fbdddfdb6f74489e712d61a59472f7f000a4429786f69ba2fca59d321c55c277ff79edb6f47c939a9e973b31f694aeca0167354ff  postmarketos-mkinitfs-1.5.1.tar.gz
 20f110337113e8de8999cf2a064a93fea36821d5c216bfa4ba46ec1f83825638262b92fd7be29eee0a85a54a108b7315a96cbe30da8ae4419f54c2ed53bb08c7  00-default.modules
 ccdceaa710d97d6f57d8d66bfcbec448486d08083341712303f62123039f729229b88528308e411a308a2b90b81b60de89fe91143a6facbb11cbc9b4055eeaec  init.sh
-9397e448c3397f48497cabc07472e6950a7e630834e019b2e37b7c8580015aff55bafdc093b3ae79939d14962b8825f15e6946003c89a4f871a0d71121443997  init_functions.sh
+4006679c81d48245877988d5f5e94db68afe6896b6ab41f0f0d7d34c12a6674fe633975a89cee707e64c07cf01ad151694e27a34948df3b65c1e6be99036f0d0  init_functions.sh
 "
diff --git a/main/postmarketos-mkinitfs/init_functions.sh b/main/postmarketos-mkinitfs/init_functions.sh
index 65fb748f1..92e27d407 100644
--- a/main/postmarketos-mkinitfs/init_functions.sh
+++ b/main/postmarketos-mkinitfs/init_functions.sh
@@ -355,6 +355,22 @@ resize_root_partition() {
 			ROOT_PARTITION_RESIZED=1
 		fi
 	fi
+
+	# Resize the root partition (non-subpartitions) on Chrome OS devices.
+	# Match $deviceinfo_cgpt_kpart not being empty instead of cmdline
+	# because it does not make sense here as all these devices use the same
+	# partitioning methods. This also resizes third partition instead of
+	# second, because these devices have an additional kernel partition
+	# at the start.
+	if [ -n "$deviceinfo_cgpt_kpart" ]; then
+		partition_dev="$(echo "$partition" | sed -E 's/p?3$//')"
+		if has_unallocated_space "$partition_dev"; then
+			echo "Resize root partition ($partition)"
+			parted -f -s "$partition_dev" resizepart 3 100%
+			partprobe
+			ROOT_PARTITION_RESIZED=1
+		fi
+	fi
 }
 
 unlock_root_partition() {