diff --git a/toolchain_config.gni b/toolchain_config.gni
index 60d1354ea46812f6576ecdabae346e2a095647c9..70978b797bedc6908f826aa7646c19820ad89ce3 100644
--- a/toolchain_config.gni
+++ b/toolchain_config.gni
@@ -21,6 +21,7 @@ if (target_cpu == "arm64") {
 
 declare_args() {
   toolchain_enable_cmc_gc = false
+  enable_base_string = false
 }
 
 if (defined(enable_cmc_gc) && !toolchain_enable_cmc_gc) {