diff --git a/packages/react-native/scripts/cocoapods/new_architecture.rb b/packages/react-native/scripts/cocoapods/new_architecture.rb
index a4e9b720040..079a6aae54f 100644
--- a/packages/react-native/scripts/cocoapods/new_architecture.rb
+++ b/packages/react-native/scripts/cocoapods/new_architecture.rb
@@ -99,6 +99,7 @@ class NewArchitectureHelper
 
 
         ReactNativePodsUtils.add_flag_to_map_with_inheritance(current_config, "OTHER_CPLUSPLUSFLAGS", self.computeFlags(new_arch_enabled))
+        ReactNativePodsUtils.add_flag_to_map_with_inheritance(current_config, "OTHER_SWIFT_FLAGS", new_arch_enabled ? " -DRCT_NEW_ARCH_ENABLED" : "")
 
         spec.dependency "React-RCTFabric" # This is for Fabric Component
         spec.dependency "ReactCodegen"