diff --git a/dev-scheme/guile/guile-2.0.13-r2.ebuild b/dev-scheme/guile/guile-2.0.13-r2.ebuild
index cb31417b38092..727bcc48100fa 100644
--- a/dev-scheme/guile/guile-2.0.13-r2.ebuild
+++ b/dev-scheme/guile/guile-2.0.13-r2.ebuild
@@ -1,4 +1,4 @@
-# Copyright 1999-2017 Gentoo Foundation
+# Copyright 1999-2018 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=6
@@ -18,7 +18,7 @@ REQUIRED_USE="regex"
 RDEPEND="
 	>=dev-libs/boehm-gc-7.0:=[threads?]
 	dev-libs/gmp:=
-	virtual/libffi
+	virtual/libffi:=
 	dev-libs/libltdl:=
 	dev-libs/libunistring:0=
 	sys-devel/libtool
diff --git a/dev-scheme/guile/guile-2.0.14-r3.ebuild b/dev-scheme/guile/guile-2.0.14-r3.ebuild
index f9a08a05028ca..f3c50eb8357e0 100644
--- a/dev-scheme/guile/guile-2.0.14-r3.ebuild
+++ b/dev-scheme/guile/guile-2.0.14-r3.ebuild
@@ -1,4 +1,4 @@
-# Copyright 1999-2018 Gentoo Foundation
+# Copyright 1999-2018 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=6
@@ -18,7 +18,7 @@ REQUIRED_USE="regex"
 RDEPEND="
 	>=dev-libs/boehm-gc-7.0:=[threads?]
 	dev-libs/gmp:=
-	virtual/libffi
+	virtual/libffi:=
 	dev-libs/libltdl:=
 	dev-libs/libunistring:0=
 	sys-devel/libtool
diff --git a/dev-scheme/guile/guile-2.2.3.ebuild b/dev-scheme/guile/guile-2.2.3.ebuild
index dbe0f04a04fff..7b949d554f8a7 100644
--- a/dev-scheme/guile/guile-2.2.3.ebuild
+++ b/dev-scheme/guile/guile-2.2.3.ebuild
@@ -1,4 +1,4 @@
-# Copyright 1999-2018 Gentoo Foundation
+# Copyright 1999-2018 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=6
@@ -20,7 +20,7 @@ RESTRICT="strip"
 RDEPEND="
 	>=dev-libs/boehm-gc-7.0:=[threads?]
 	dev-libs/gmp:=
-	virtual/libffi
+	virtual/libffi:=
 	dev-libs/libltdl:=
 	dev-libs/libunistring:0=
 	sys-devel/libtool