diff --git a/dev-ml/unidecode/files/unidecode-0.4.0-test.patch b/dev-ml/unidecode/files/unidecode-0.4.0-test.patch
new file mode 100644
index 0000000000000..039de4e1b5645
--- /dev/null
+++ b/dev-ml/unidecode/files/unidecode-0.4.0-test.patch
@@ -0,0 +1,8 @@
+--- a/test/test_data.ml	2021-01-10 22:20:26.800309802 +0100
++++ b/test/test_data.ml	2021-01-10 22:20:36.290138477 +0100
+@@ -46,4 +46,4 @@
+    Norvegi, Finland, Estoni, Latvi, Litva, Pol'cho, Belarous', OUkraina, \
+    Gurji, Azerbaidjan, Kazakhstan, KHitad, Mongol, KHoito Solongos geһen \
+    arban durben gurenuudte khile zourydag, mun ouһaar ANOU-ai Alyaska \
+-   mojotoi bolon YApon oulastai khile negetei. "
++   mojotoi bolon YApon oulastai khile negetei."
diff --git a/dev-ml/unidecode/unidecode-0.4.0.ebuild b/dev-ml/unidecode/unidecode-0.4.0.ebuild
index b688317ca2ba5..8af7cc493372d 100644
--- a/dev-ml/unidecode/unidecode-0.4.0.ebuild
+++ b/dev-ml/unidecode/unidecode-0.4.0.ebuild
@@ -13,8 +13,12 @@ SRC_URI="https://github.com/geneweb/${PN}/archive/v${PV}.tar.gz
 LICENSE="GPL-3"
 SLOT="0/${PV}"
 KEYWORDS="~amd64 ~x86"
-IUSE="+ocamlopt"
+IUSE="+ocamlopt test"
+RESTRICT="!test? ( test )"
 
-DEPEND=""
-RDEPEND="${DEPEND}"
+RDEPEND=""
+DEPEND="${DEPEND}
+	test? ( dev-ml/ounit2 )"
 BDEPEND=""
+
+PATCHES=( "${FILESDIR}"/${P}-test.patch )