diff --git a/build/config/compiler.gni b/build/config/compiler.gni
index 6ac5c84..ddab20de 100644
--- a/build/config/compiler.gni
+++ b/build/config/compiler.gni
@@ -6,7 +6,7 @@
   # TODO(https://fxbug.dev/42170458): consider "debug"
   default_optimize = "none"
 } else {
-  default_optimize = "size"
+  default_optimize = "size_lto"
 }
 
 # NOTE: Keep in sync with //build/config/zircon/levels.gni