diff --git a/assets/base.mozconfig b/assets/base.mozconfig
index 4548526..297022b 100644
--- a/assets/base.mozconfig
+++ b/assets/base.mozconfig
@@ -40,7 +40,8 @@ export MOZ_REQUIRE_SIGNING=
 # SPEED
 ac_add_options --enable-optimize
 ac_add_options --enable-rust-simd
-ac_add_options --enable-lto
+ac_add_options MOZ_THIN_LTO=1
+export MOZ_THIN_LTO=1
 # ac_add_options --disable-debug
 # ac_add_options --disable-debug-symbols
 # ac_add_options --disable-debug-js-modules