diff --git a/dev-haskell/happstack-server/happstack-server-7.3.9.ebuild b/dev-haskell/happstack-server/happstack-server-7.3.9.ebuild
index 004b8b1f45df5..f2fe1b2c914fc 100644
--- a/dev-haskell/happstack-server/happstack-server-7.3.9.ebuild
+++ b/dev-haskell/happstack-server/happstack-server-7.3.9.ebuild
@@ -1,4 +1,4 @@
-# Copyright 1999-2014 Gentoo Foundation
+# Copyright 1999-2019 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=5
@@ -16,7 +16,7 @@ SRC_URI="mirror://hackage/packages/archive/${PN}/${PV}/${P}.tar.gz"
 LICENSE="BSD"
 SLOT="0/${PV}"
 KEYWORDS="~amd64 ~x86"
-IUSE="+network-uri +template_haskell"
+IUSE="+network-uri +template-haskell"
 
 RDEPEND=">=dev-haskell/base64-bytestring-1.0:=[profile?] <dev-haskell/base64-bytestring-1.1:=[profile?]
 	>=dev-haskell/blaze-html-0.5:=[profile?] <dev-haskell/blaze-html-0.8:=[profile?]
@@ -51,5 +51,5 @@ src_configure() {
 	haskell-cabal_src_configure \
 		$(cabal_flag network-uri network-uri) \
 		--flag=network_2_2_3 \
-		$(cabal_flag template_haskell template_haskell)
+		$(cabal_flag template-haskell template_haskell)
 }
diff --git a/dev-haskell/happstack-server/happstack-server-7.4.5.ebuild b/dev-haskell/happstack-server/happstack-server-7.4.5.ebuild
index 8a1a3a96308b6..baacd28f94fa8 100644
--- a/dev-haskell/happstack-server/happstack-server-7.4.5.ebuild
+++ b/dev-haskell/happstack-server/happstack-server-7.4.5.ebuild
@@ -1,4 +1,4 @@
-# Copyright 1999-2015 Gentoo Foundation
+# Copyright 1999-2019 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=5
@@ -16,7 +16,7 @@ SRC_URI="mirror://hackage/packages/archive/${PN}/${PV}/${P}.tar.gz"
 LICENSE="BSD"
 SLOT="0/${PV}"
 KEYWORDS="~amd64 ~x86"
-IUSE="+network-uri +template_haskell"
+IUSE="+network-uri +template-haskell"
 
 RDEPEND=">=dev-haskell/base64-bytestring-1.0:=[profile?] <dev-haskell/base64-bytestring-1.1:=[profile?]
 	>=dev-haskell/blaze-html-0.5:=[profile?] <dev-haskell/blaze-html-0.9:=[profile?]
@@ -54,5 +54,5 @@ src_configure() {
 	haskell-cabal_src_configure \
 		$(cabal_flag network-uri network-uri) \
 		--flag=network_2_2_3 \
-		$(cabal_flag template_haskell template_haskell)
+		$(cabal_flag template-haskell template_haskell)
 }
diff --git a/dev-haskell/happstack-server/happstack-server-7.4.6.1.ebuild b/dev-haskell/happstack-server/happstack-server-7.4.6.1.ebuild
index a3a3ca292e73e..d3baa58a10f7c 100644
--- a/dev-haskell/happstack-server/happstack-server-7.4.6.1.ebuild
+++ b/dev-haskell/happstack-server/happstack-server-7.4.6.1.ebuild
@@ -1,4 +1,4 @@
-# Copyright 1999-2016 Gentoo Foundation
+# Copyright 1999-2019 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=5
@@ -16,7 +16,7 @@ SRC_URI="mirror://hackage/packages/archive/${PN}/${PV}/${P}.tar.gz"
 LICENSE="BSD"
 SLOT="0/${PV}"
 KEYWORDS="~amd64 ~x86"
-IUSE="+network-uri +template_haskell"
+IUSE="+network-uri +template-haskell"
 
 RDEPEND=">=dev-haskell/base64-bytestring-1.0:=[profile?] <dev-haskell/base64-bytestring-1.1:=[profile?]
 	>=dev-haskell/blaze-html-0.5:=[profile?] <dev-haskell/blaze-html-0.9:=[profile?]
@@ -54,5 +54,5 @@ src_configure() {
 	haskell-cabal_src_configure \
 		$(cabal_flag network-uri network-uri) \
 		--flag=network_2_2_3 \
-		$(cabal_flag template_haskell template_haskell)
+		$(cabal_flag template-haskell template_haskell)
 }
diff --git a/dev-haskell/happstack-server/happstack-server-7.4.6.2.ebuild b/dev-haskell/happstack-server/happstack-server-7.4.6.2.ebuild
index 40b969bb48e2b..8c0194caeea6e 100644
--- a/dev-haskell/happstack-server/happstack-server-7.4.6.2.ebuild
+++ b/dev-haskell/happstack-server/happstack-server-7.4.6.2.ebuild
@@ -1,4 +1,4 @@
-# Copyright 1999-2017 Gentoo Foundation
+# Copyright 1999-2019 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=6
@@ -16,7 +16,7 @@ SRC_URI="mirror://hackage/packages/archive/${PN}/${PV}/${P}.tar.gz"
 LICENSE="BSD"
 SLOT="0/${PV}"
 KEYWORDS="~amd64 ~x86"
-IUSE="+network-uri +template_haskell"
+IUSE="+network-uri +template-haskell"
 
 RDEPEND=">=dev-haskell/base64-bytestring-1.0:=[profile?] <dev-haskell/base64-bytestring-1.1:=[profile?]
 	>=dev-haskell/blaze-html-0.5:=[profile?] <dev-haskell/blaze-html-0.9:=[profile?]
@@ -54,5 +54,5 @@ src_configure() {
 	haskell-cabal_src_configure \
 		$(cabal_flag network-uri network-uri) \
 		--flag=network_2_2_3 \
-		$(cabal_flag template_haskell template_haskell)
+		$(cabal_flag template-haskell template_haskell)
 }
diff --git a/dev-haskell/happstack-server/metadata.xml b/dev-haskell/happstack-server/metadata.xml
index 8a3c718999b70..8de693a1c5015 100644
--- a/dev-haskell/happstack-server/metadata.xml
+++ b/dev-haskell/happstack-server/metadata.xml
@@ -10,6 +10,6 @@
 	</longdescription>
 	<use>
 		<flag name="network-uri">Get Network.URI from the network-uri package</flag>
-		<flag name="template_haskell">Description: Template Haskell is available on this system</flag>
+		<flag name="template-haskell">Description: Template Haskell is available on this system</flag>
 	</use>
 </pkgmetadata>