diff --git a/dev-python/mpxj/mpxj-13.2.1.ebuild b/dev-python/mpxj/mpxj-13.2.1.ebuild
index 17fdaa74d9..83a0b31b3c 100644
--- a/dev-python/mpxj/mpxj-13.2.1.ebuild
+++ b/dev-python/mpxj/mpxj-13.2.1.ebuild
@@ -14,7 +14,7 @@ HOMEPAGE="
 	https://github.com/joniles/mpxj/
 "
 SRC_URI="$(pypi_wheel_url)"
-S=${WORKDIR}
+S="${WORKDIR}"
 
 LICENSE="LGPL-2.1"
 SLOT="0"