diff --git a/net-analyzer/nmap/nmap-7.92.ebuild b/net-analyzer/nmap/nmap-7.92.ebuild
index 348adce730a5c..8578d039870fa 100644
--- a/net-analyzer/nmap/nmap-7.92.ebuild
+++ b/net-analyzer/nmap/nmap-7.92.ebuild
@@ -1,4 +1,4 @@
-# Copyright 1999-2021 Gentoo Authors
+# Copyright 1999-2022 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=7
@@ -121,7 +121,9 @@ src_compile() {
 }
 
 src_install() {
+	# See bug #831713 for return of -j1
 	LC_ALL=C emake \
+		-j1 \
 		DESTDIR="${D}" \
 		STRIP=: \
 		nmapdatadir="${EPREFIX}"/usr/share/nmap \
diff --git a/net-analyzer/nmap/nmap-9999.ebuild b/net-analyzer/nmap/nmap-9999.ebuild
index 466e9b414a06d..e04fab825e5c5 100644
--- a/net-analyzer/nmap/nmap-9999.ebuild
+++ b/net-analyzer/nmap/nmap-9999.ebuild
@@ -1,4 +1,4 @@
-# Copyright 1999-2021 Gentoo Authors
+# Copyright 1999-2022 Gentoo Authors
 # Distributed under the terms of the GNU General Public License v2
 
 EAPI=7
@@ -122,7 +122,9 @@ src_compile() {
 }
 
 src_install() {
+	# See bug #831713 for return of -j1
 	LC_ALL=C emake \
+		-j1 \
 		DESTDIR="${D}" \
 		STRIP=: \
 		nmapdatadir="${EPREFIX}"/usr/share/nmap \