diff --git a/toolchain_config.gni b/toolchain_config.gni
index 51120f4d526b918417708c36d506116a53b209a1..6ef2388e8418f6f380bcf0eb9588cd4fef2d4947 100644
--- a/toolchain_config.gni
+++ b/toolchain_config.gni
@@ -20,10 +20,10 @@ if (target_cpu == "arm64") {
 }
 
 declare_args() {
-  toolchain_enable_cmc_gc = (!is_mac && !is_mingw)
+  toolchain_enable_cmc_gc = false
 }
 
-if (defined(enable_cmc_gc) && toolchain_enable_cmc_gc) {
+if (defined(enable_cmc_gc)) {
   toolchain_enable_cmc_gc = enable_cmc_gc
 }