diff --git a/packages/react-native/Libraries/MutationObserver/NativeMutationObserver.cpp b/packages/react-native/ReactCommon/react/nativemodule/mutationobserver/NativeMutationObserver.cpp
similarity index 100%
rename from packages/react-native/Libraries/MutationObserver/NativeMutationObserver.cpp
rename to packages/react-native/ReactCommon/react/nativemodule/mutationobserver/NativeMutationObserver.cpp
diff --git a/packages/react-native/Libraries/MutationObserver/NativeMutationObserver.h b/packages/react-native/ReactCommon/react/nativemodule/mutationobserver/NativeMutationObserver.h
similarity index 98%
rename from packages/react-native/Libraries/MutationObserver/NativeMutationObserver.h
rename to packages/react-native/ReactCommon/react/nativemodule/mutationobserver/NativeMutationObserver.h
index 9d01507b4103fd..1c067677b3a574 100644
--- a/packages/react-native/Libraries/MutationObserver/NativeMutationObserver.h
+++ b/packages/react-native/ReactCommon/react/nativemodule/mutationobserver/NativeMutationObserver.h
@@ -10,8 +10,7 @@
 #include <FBReactNativeSpec/FBReactNativeSpecJSI.h>
 #include <react/renderer/observers/mutation/MutationObserverManager.h>
 #include <react/renderer/uimanager/UIManager.h>
-#include <optional>
-#include <string>
+#include <functional>
 #include <vector>
 
 namespace facebook::react {