diff --git a/dev-util/boost-build/boost-build-1.70.0.ebuild b/dev-util/boost-build/boost-build-1.70.0.ebuild
index 954e06df94539..fd6a1f8d22695 100644
--- a/dev-util/boost-build/boost-build-1.70.0.ebuild
+++ b/dev-util/boost-build/boost-build-1.70.0.ebuild
@@ -65,7 +65,7 @@ src_prepare() {
 	cd "${S}/engine" || die
 	sed -i \
 		-e 's|-s\b||' \
-		-e "/libpython/s/lib ]/$(get_libdir) ]/" \
+		-e "/libpython/s;lib ];$(get_libdir) ];" \
 		build.jam || die "sed failed"
 
 	# Force regeneration