diff --git a/testing/csync2/APKBUILD b/testing/csync2/APKBUILD
index 6c4096a632c..35ddd7d0e98 100644
--- a/testing/csync2/APKBUILD
+++ b/testing/csync2/APKBUILD
@@ -6,7 +6,7 @@ pkgdesc="a cluster synchronization tool"
 url="http://oss.linbit.com/csync2/"
 license="GPL-2+"
 depends=
-makedepends="librsync-dev gnutls-dev sqlite-dev autoconf automake"
+makedepends="librsync-dev gnutls-dev sqlite-dev autoconf automake bison flex"
 install=
 subpackages="$pkgname-doc"
 source="http://oss.linbit.com/csync2/csync2-$pkgver.tar.gz