diff --git a/packages/react-native/Libraries/AppDelegate/RCTDefaultReactNativeFactoryDelegate.mm b/packages/react-native/Libraries/AppDelegate/RCTDefaultReactNativeFactoryDelegate.mm
index f780a8911279..725c37baf52b 100644
--- a/packages/react-native/Libraries/AppDelegate/RCTDefaultReactNativeFactoryDelegate.mm
+++ b/packages/react-native/Libraries/AppDelegate/RCTDefaultReactNativeFactoryDelegate.mm
@@ -45,6 +45,10 @@ - (JSRuntimeFactoryRef)createJSRuntimeFactory
 {
 #if USE_THIRD_PARTY_JSC != 1
   return jsrt_create_hermes_factory();
+#else
+  [NSException raise:@"JSRuntimeFactory"
+              format:@"createJSRuntimeFactory must be overridden when using third-party JSC"];
+  return nil;
 #endif
 }
 
diff --git a/packages/react-native/scripts/react_native_pods.rb b/packages/react-native/scripts/react_native_pods.rb
index d157fce21723..264891cf10a3 100644
--- a/packages/react-native/scripts/react_native_pods.rb
+++ b/packages/react-native/scripts/react_native_pods.rb
@@ -78,7 +78,7 @@ def use_react_native! (
   react_native_path = Pod::Config.instance.installation_root.join(path)
   prefix = react_native_path.relative_path_from(Pod::Config.instance.installation_root)
 
-  hermes_enabled= true
+  hermes_enabled= !use_third_party_jsc()
   # Set the app_path as env variable so the podspecs can access it.
   ENV['APP_PATH'] = app_path
   ENV['REACT_NATIVE_PATH'] = react_native_path.to_s