diff --git a/dev-python/PyQt5/PyQt5-5.14.2.ebuild b/dev-python/PyQt5/PyQt5-5.14.2.ebuild
index 94bbc2a6c2c0..b536cd41155c 100644
--- a/dev-python/PyQt5/PyQt5-5.14.2.ebuild
+++ b/dev-python/PyQt5/PyQt5-5.14.2.ebuild
@@ -177,7 +177,7 @@ src_compile() {
 src_install() {
 	installation() {
 		local tmp_root=${D}/${PN}_tmp_root
-		emake INSTALL_ROOT="${tmp_root}" install
+		emake INSTALL_ROOT="${tmp_root}" install -j1 # 720002
 
 		local bin_dir=${tmp_root}${EPREFIX}/usr/bin
 		local exe