diff --git a/testing/btrfs-compsize/APKBUILD b/testing/btrfs-compsize/APKBUILD
new file mode 100644
index 00000000000..3ad323630b9
--- /dev/null
+++ b/testing/btrfs-compsize/APKBUILD
@@ -0,0 +1,30 @@
+# Contributor: Michał Polański <michal@polanski.me>
+# Maintainer: Michał Polański <michal@polanski.me>
+pkgname=btrfs-compsize
+_pkgname=compsize
+pkgver=1.3
+pkgrel=0
+pkgdesc="Calculate compression ratio of a set of files on Btrfs"
+url="https://github.com/kilobyte/compsize"
+arch="all"
+license="GPL-2.0-or-later"
+makedepends="btrfs-progs-dev"
+options="!check" # no test suite
+subpackages="$pkgname-doc"
+source="$_pkgname-$pkgver.tar.gz::https://github.com/kilobyte/compsize/archive/v$pkgver.tar.gz"
+builddir="$srcdir/$_pkgname-$pkgver"
+
+build() {
+	make
+}
+
+package() {
+	install -d "$pkgdir"/usr/share/man/man8
+	make PREFIX="$pkgdir" install
+
+	# compsize requires root privileges
+	install -d "$pkgdir"/usr/sbin
+	mv "$pkgdir"/usr/bin/compsize "$pkgdir"/usr/sbin
+}
+
+sha512sums="411b92651fdc3d03deccbf38f72936fee95cf80c67d6368efbc0dafacfe9793815a23ef0d02f7feadf31391e415df3d90cd19fb3acc8cce94f37cb3e4eed623d  compsize-1.3.tar.gz"