diff --git a/toolchain_config.gni b/toolchain_config.gni
index 3065af5ae88b82d980dda05ac86e692c644bf6d1..69b0581b0034f7397db3939963e02e6c88919d1d 100644
--- a/toolchain_config.gni
+++ b/toolchain_config.gni
@@ -20,10 +20,10 @@ if (target_cpu == "arm64") {
 }
 
 declare_args() {
-  toolchain_enable_cmc_gc = false
+  toolchain_enable_cmc_gc = true
 }
 
-if (defined(enable_cmc_gc) && !toolchain_enable_cmc_gc) {
+if (defined(enable_cmc_gc) && toolchain_enable_cmc_gc) {
   toolchain_enable_cmc_gc = enable_cmc_gc
 }