diff --git a/dev-db/mongodb/mongodb-4.4.24.ebuild b/dev-db/mongodb/mongodb-4.4.24.ebuild
index 94afac5..0124614 100644
--- a/dev-db/mongodb/mongodb-4.4.24.ebuild
+++ b/dev-db/mongodb/mongodb-4.4.24.ebuild
@@ -130,6 +130,9 @@ src_configure() {
 	# Gentoo's toolchain applies these anyway
 	scons_opts+=( --runtime-hardening=off )
 
+	# refers to a non-functional feature as of Aug 2023, removed with 4.4.25
+	scons_opts+=( --enable-free-mon=off )
+
 	# respect mongoDB upstream's basic recommendations
 	# see bug #536688 and #526114
 	if ! use debug; then
diff --git a/dev-db/mongodb/mongodb-5.0.20.ebuild b/dev-db/mongodb/mongodb-5.0.20.ebuild
index 6ebf3b6..3480dbc 100644
--- a/dev-db/mongodb/mongodb-5.0.20.ebuild
+++ b/dev-db/mongodb/mongodb-5.0.20.ebuild
@@ -151,6 +151,9 @@ src_configure() {
 		 scons_opts+=( --linker=bfd )
 	fi
 
+	# refers to a non-functional feature as of Aug 2023, removed with 5.0.21
+	scons_opts+=( --enable-free-mon=off )
+
 	# respect mongoDB upstream's basic recommendations
 	# see bug #536688 and #526114
 	if ! use debug; then