diff --git a/net-proxy/haproxy/haproxy-1.6.9.ebuild b/net-proxy/haproxy/haproxy-1.6.9.ebuild
index a0703717fcd7b..c9a98ed4d849f 100644
--- a/net-proxy/haproxy/haproxy-1.6.9.ebuild
+++ b/net-proxy/haproxy/haproxy-1.6.9.ebuild
@@ -15,8 +15,9 @@ SRC_URI="http://haproxy.1wt.eu/download/$(get_version_component_range 1-2)/src/$
 LICENSE="GPL-2 LGPL-2.1"
 SLOT="0"
 KEYWORDS="~amd64 ~arm ~ppc ~x86"
-IUSE="+crypt doc examples libressl net_ns +pcre pcre-jit ssl tools vim-syntax +zlib" # lua
-REQUIRED_USE="pcre-jit? ( pcre )"
+IUSE="+crypt doc examples libressl slz net_ns +pcre pcre-jit ssl tools vim-syntax +zlib" # lua
+REQUIRED_USE="pcre-jit? ( pcre )
+	?? ( slz zlib )"
 
 DEPEND="
 	pcre? (
@@ -27,6 +28,7 @@ DEPEND="
 		!libressl? ( dev-libs/openssl:0=[zlib?] )
 		libressl? ( dev-libs/libressl:0= )
 	)
+	slz? ( dev-libs/libslz:= )
 	zlib? ( sys-libs/zlib )"
 # lua? ( dev-lang/lua:5.3 )
 RDEPEND="${DEPEND}"
@@ -79,6 +81,7 @@ src_compile() {
 #	args+=( $(haproxy_use kernel_linux LINUX_TPROXY) )
 
 	args+=( $(haproxy_use ssl OPENSSL) )
+	args+=( $(haproxy_use slz SLZ) )
 	args+=( $(haproxy_use zlib ZLIB) )
 
 	# For now, until the strict-aliasing breakage will be fixed
diff --git a/net-proxy/haproxy/haproxy-9999.ebuild b/net-proxy/haproxy/haproxy-9999.ebuild
index 9499a51177907..4100bfa773873 100644
--- a/net-proxy/haproxy/haproxy-9999.ebuild
+++ b/net-proxy/haproxy/haproxy-9999.ebuild
@@ -15,8 +15,9 @@ EGIT_REPO_URI="http://master.formilux.org/git/people/willy/haproxy.git"
 LICENSE="GPL-2 LGPL-2.1"
 SLOT="0"
 KEYWORDS=""
-IUSE="+crypt doc examples libressl net_ns +pcre pcre-jit ssl tools vim-syntax +zlib" # lua
-REQUIRED_USE="pcre-jit? ( pcre )"
+IUSE="+crypt doc examples libressl slz net_ns +pcre pcre-jit ssl tools vim-syntax +zlib" # lua
+REQUIRED_USE="pcre-jit? ( pcre )
+	?? ( slz zlib )"
 
 DEPEND="
 	pcre? (
@@ -27,6 +28,7 @@ DEPEND="
 		!libressl? ( dev-libs/openssl:0=[zlib?] )
 		libressl? ( dev-libs/libressl:0= )
 	)
+	slz? ( dev-libs/libslz:= )
 	zlib? ( sys-libs/zlib )"
 # lua? ( dev-lang/lua:5.3 )
 RDEPEND="${DEPEND}"
@@ -79,6 +81,7 @@ src_compile() {
 #	args+=( $(haproxy_use kernel_linux LINUX_TPROXY) )
 
 	args+=( $(haproxy_use ssl OPENSSL) )
+	args+=( $(haproxy_use slz SLZ) )
 	args+=( $(haproxy_use zlib ZLIB) )
 
 	# For now, until the strict-aliasing breakage will be fixed
diff --git a/net-proxy/haproxy/metadata.xml b/net-proxy/haproxy/metadata.xml
index 56529589cf4ce..2aaccf14afe72 100644
--- a/net-proxy/haproxy/metadata.xml
+++ b/net-proxy/haproxy/metadata.xml
@@ -21,6 +21,7 @@ Its event-driven architecture allows it to easily handle thousands of simultaneo
 	<use>
 		<flag name="net_ns">Enable network namespace support (CONFIG_NET_NS)</flag>
 		<flag name="pcre-jit">Use JIT support for PCRE</flag>
+		<flag name="slz">Use <pkg>dev-libs/libslz</pkg> compression library</flag>
 		<flag name="tools">Install additional tools (halog, iprange)</flag>
 	</use>
 </pkgmetadata>