diff --git a/sys-apps/portage/portage-3.0.20-r6.ebuild b/sys-apps/portage/portage-3.0.20-r6.ebuild
index 9cac0509113be..5c2548d93f0b4 100644
--- a/sys-apps/portage/portage-3.0.20-r6.ebuild
+++ b/sys-apps/portage/portage-3.0.20-r6.ebuild
@@ -118,7 +118,7 @@ python_prepare_all() {
 	fi
 
 	if use native-extensions; then
-		printf "[build_ext]\nportage-ext-modules=true\n" >> \
+		printf "[build_ext]\nportage_ext_modules=true\n" >> \
 			setup.cfg || die
 	fi