diff --git a/dev-python/async_timeout/async_timeout-4.0.0.ebuild b/dev-python/async_timeout/async_timeout-4.0.0.ebuild
index 2f3850143bcd5..b5f424cc0c74f 100644
--- a/dev-python/async_timeout/async_timeout-4.0.0.ebuild
+++ b/dev-python/async_timeout/async_timeout-4.0.0.ebuild
@@ -18,6 +18,7 @@ KEYWORDS="~alpha ~amd64 ~arm ~arm64 ~hppa ~ia64 ~ppc ~ppc64 ~riscv ~sparc ~x86 ~
 
 BDEPEND="
 	dev-python/setuptools_scm[${PYTHON_USEDEP}]
+	dev-python/typing-extensions[${PYTHON_USEDEP}]
 	test? (
 		dev-python/pytest-aiohttp[${PYTHON_USEDEP}]
 		dev-python/pytest-asyncio[${PYTHON_USEDEP}]