diff --git a/packages/react-native/Libraries/TypeSafety/RCTConvertHelpers.h b/packages/react-native/Libraries/TypeSafety/RCTConvertHelpers.h
index f47ddeae42994c..84e5a4f2b405b3 100644
--- a/packages/react-native/Libraries/TypeSafety/RCTConvertHelpers.h
+++ b/packages/react-native/Libraries/TypeSafety/RCTConvertHelpers.h
@@ -67,7 +67,7 @@ template <typename T>
 facebook::react::LazyVector<T> RCTBridgingToVec(id value, T (^ctor)(id element))
 {
   NSArray *array = RCTBridgingToArray(value);
-  typedef typename facebook::react::LazyVector<T>::size_type _size_t;
+  using _size_t = typename facebook::react::LazyVector<T>::size_type;
   _size_t size = static_cast<_size_t>(array.count);
   return facebook::react::LazyVector<T>::fromUnsafeRawValue(array, size, ctor);
 }
diff --git a/packages/react-native/React/Base/RCTUtils.mm b/packages/react-native/React/Base/RCTUtils.mm
index 9fdcda04e7f371..55a4ec1527fa80 100644
--- a/packages/react-native/React/Base/RCTUtils.mm
+++ b/packages/react-native/React/Base/RCTUtils.mm
@@ -710,13 +710,13 @@ BOOL RCTIsGzippedData(NSData *__nullable data)
 
   void *libz = dlopen("/usr/lib/libz.dylib", RTLD_LAZY);
 
-  typedef int (*DeflateInit2_)(z_streamp, int, int, int, int, int, const char *, int);
+  using DeflateInit2_ = int (*)(z_streamp, int, int, int, int, int, const char *, int);
   DeflateInit2_ deflateInit2_ = (DeflateInit2_)dlsym(libz, "deflateInit2_");
 
-  typedef int (*Deflate)(z_streamp, int);
+  using Deflate = int (*)(z_streamp, int);
   Deflate deflate = (Deflate)dlsym(libz, "deflate");
 
-  typedef int (*DeflateEnd)(z_streamp);
+  using DeflateEnd = int (*)(z_streamp);
   DeflateEnd deflateEnd = (DeflateEnd)dlsym(libz, "deflateEnd");
 
   z_stream stream;