diff --git a/dev-haskell/monad-logger/metadata.xml b/dev-haskell/monad-logger/metadata.xml
index b83f7e64803f7..d83f8eff01238 100644
--- a/dev-haskell/monad-logger/metadata.xml
+++ b/dev-haskell/monad-logger/metadata.xml
@@ -6,7 +6,7 @@
 		<name>Gentoo Haskell</name>
 	</maintainer>
 	<use>
-		<flag name="template_haskell">Enable Template Haskell support.</flag>
+		<flag name="template-haskell">Enable Template Haskell support.</flag>
 	</use>
 	<longdescription>
 		This package uses template-haskell for determining source code locations of messages.
diff --git a/dev-haskell/monad-logger/monad-logger-0.3.17.ebuild b/dev-haskell/monad-logger/monad-logger-0.3.17.ebuild
index ae088f8898f84..e84d8f4f22867 100644
--- a/dev-haskell/monad-logger/monad-logger-0.3.17.ebuild
+++ b/dev-haskell/monad-logger/monad-logger-0.3.17.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
@@ -15,7 +15,7 @@ SRC_URI="mirror://hackage/packages/archive/${PN}/${PV}/${P}.tar.gz"
 LICENSE="MIT"
 SLOT="0/${PV}"
 KEYWORDS="~amd64 ~x86"
-IUSE="+template_haskell"
+IUSE="+template-haskell"
 
 RDEPEND="dev-haskell/blaze-builder:=[profile?]
 	>=dev-haskell/conduit-1.0:=[profile?] <dev-haskell/conduit-1.3:=[profile?]
@@ -41,5 +41,5 @@ DEPEND="${RDEPEND}
 
 src_configure() {
 	haskell-cabal_src_configure \
-		$(cabal_flag template_haskell template_haskell)
+		$(cabal_flag template-haskell template_haskell)
 }
diff --git a/dev-haskell/monad-logger/monad-logger-0.3.18.ebuild b/dev-haskell/monad-logger/monad-logger-0.3.18.ebuild
index ae088f8898f84..e84d8f4f22867 100644
--- a/dev-haskell/monad-logger/monad-logger-0.3.18.ebuild
+++ b/dev-haskell/monad-logger/monad-logger-0.3.18.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
@@ -15,7 +15,7 @@ SRC_URI="mirror://hackage/packages/archive/${PN}/${PV}/${P}.tar.gz"
 LICENSE="MIT"
 SLOT="0/${PV}"
 KEYWORDS="~amd64 ~x86"
-IUSE="+template_haskell"
+IUSE="+template-haskell"
 
 RDEPEND="dev-haskell/blaze-builder:=[profile?]
 	>=dev-haskell/conduit-1.0:=[profile?] <dev-haskell/conduit-1.3:=[profile?]
@@ -41,5 +41,5 @@ DEPEND="${RDEPEND}
 
 src_configure() {
 	haskell-cabal_src_configure \
-		$(cabal_flag template_haskell template_haskell)
+		$(cabal_flag template-haskell template_haskell)
 }
diff --git a/dev-haskell/monad-logger/monad-logger-0.3.20.1.ebuild b/dev-haskell/monad-logger/monad-logger-0.3.20.1.ebuild
index 42ee80ded7b9a..cf88a7efec3f8 100644
--- a/dev-haskell/monad-logger/monad-logger-0.3.20.1.ebuild
+++ b/dev-haskell/monad-logger/monad-logger-0.3.20.1.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
@@ -15,7 +15,7 @@ SRC_URI="mirror://hackage/packages/archive/${PN}/${PV}/${P}.tar.gz"
 LICENSE="MIT"
 SLOT="0/${PV}"
 KEYWORDS="~amd64 ~x86"
-IUSE="+template_haskell"
+IUSE="+template-haskell"
 
 RDEPEND="dev-haskell/blaze-builder:=[profile?]
 	>=dev-haskell/conduit-1.0:=[profile?] <dev-haskell/conduit-1.3:=[profile?]
@@ -40,5 +40,5 @@ DEPEND="${RDEPEND}
 
 src_configure() {
 	haskell-cabal_src_configure \
-		$(cabal_flag template_haskell template_haskell)
+		$(cabal_flag template-haskell template_haskell)
 }