diff --git a/dev-haskell/happy/happy-1.20.1.1.ebuild b/dev-haskell/happy/happy-1.20.1.1.ebuild
index de73725aa6600..413f2a94abbca 100644
--- a/dev-haskell/happy/happy-1.20.1.1.ebuild
+++ b/dev-haskell/happy/happy-1.20.1.1.ebuild
@@ -1,4 +1,4 @@
-# Copyright 1999-2023 Gentoo Authors
+# Copyright 1999-2026 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=8
@@ -67,3 +67,7 @@ src_install() {
 		doman doc/happy.1
 	fi
 }
+
+src_test() {
+	happy_datadir="${S}/data" haskell-cabal_src_test
+}