diff --git a/dev-cpp/folly/folly-2024.11.04.00.ebuild b/dev-cpp/folly/folly-2024.11.04.00.ebuild
index 27be95cd3414..e55339ec78a5 100644
--- a/dev-cpp/folly/folly-2024.11.04.00.ebuild
+++ b/dev-cpp/folly/folly-2024.11.04.00.ebuild
@@ -13,7 +13,7 @@ EAPI=8
 # dev-cpp/wangle
 # dev-util/watchman
 
-inherit cmake
+inherit flag-o-matic cmake
 
 DESCRIPTION="An open-source C++ library developed and used at Facebook"
 HOMEPAGE="https://github.com/facebook/folly"
@@ -75,6 +75,9 @@ src_configure() {
 		-DCMAKE_LIBRARY_ARCHITECTURE=$(usex amd64 x86_64 ${ARCH})
 	)
 
+	# https://github.com/facebook/folly/issues/1984
+	use arm64 && append-cxxflags "-flax-vector-conversions"
+
 	cmake_src_configure
 }