diff --git a/dev-libs/kopeninghours/kopeninghours-23.08.4.ebuild b/dev-libs/kopeninghours/kopeninghours-23.08.4.ebuild
index 8c9a5cf8e1a49..02794ef1f6e41 100644
--- a/dev-libs/kopeninghours/kopeninghours-23.08.4.ebuild
+++ b/dev-libs/kopeninghours/kopeninghours-23.08.4.ebuild
@@ -1,4 +1,4 @@
-# Copyright 1999-2023 Gentoo Authors
+# Copyright 1999-2024 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=8
@@ -40,7 +40,7 @@ RDEPEND="${DEPEND}
 "
 BDEPEND="
 	sys-devel/bison
-	sys-devel/flex
+	app-alternatives/lex
 "
 
 PATCHES=( "${FILESDIR}"/${PN}-22.04.0-boostpython.patch )