diff --git a/packages/react-native/React/I18n/FBXXHashUtils.h b/packages/react-native/React/I18n/FBXXHashUtils.h
index a0902ea0d84..3609705f6bc 100644
--- a/packages/react-native/React/I18n/FBXXHashUtils.h
+++ b/packages/react-native/React/I18n/FBXXHashUtils.h
@@ -29,39 +29,49 @@
 NS_ASSUME_NONNULL_BEGIN
 
 /// magic constants :-)
-static const uint64_t PRIME1 = 11400714785074694791ULL;
-static const uint64_t PRIME2 = 14029467366897019727ULL;
-static const uint64_t PRIME3 = 1609587929392839161ULL;
-static const uint64_t PRIME4 = 9650029242287828579ULL;
-static const uint64_t PRIME5 = 2870177450012600261ULL;
+static const uint64_t METAXXHASHUTILS_PRIME_1 = 11400714785074694791ULL;
+static const uint64_t METAXXHASHUTILS_PRIME_2 = 14029467366897019727ULL;
+static const uint64_t METAXXHASHUTILS_PRIME_3 = 1609587929392839161ULL;
+static const uint64_t METAXXHASHUTILS_PRIME_4 = 9650029242287828579ULL;
+static const uint64_t METAXXHASHUTILS_PRIME_5 = 2870177450012600261ULL;
 
-NS_INLINE uint64_t rotl(uint64_t x, int r)
+#define METAXXHASHUTILS_INLINE_ATTRS \
+        NS_SWIFT_UNAVAILABLE("You'll need to bridge to C/ObjC to use this API.") \
+        NS_INLINE
+
+METAXXHASHUTILS_INLINE_ATTRS
+uint64_t rotl(uint64_t x, int r)
 {
   return ((x << r) | (x >> (64 - r)));
 }
 
-NS_INLINE uint64_t mix1(const uint64_t h, const uint64_t prime, int rshift)
+METAXXHASHUTILS_INLINE_ATTRS
+uint64_t mix1(const uint64_t h, const uint64_t prime, int rshift)
 {
   return (h ^ (h >> rshift)) * prime;
 }
 
-NS_INLINE uint64_t mix2(const uint64_t p, const uint64_t v)
+METAXXHASHUTILS_INLINE_ATTRS
+uint64_t mix2(const uint64_t p, const uint64_t v)
 {
-  return rotl(v + p * PRIME2, 31) * PRIME1;
+  return rotl(v + p * METAXXHASHUTILS_PRIME_2, 31) * METAXXHASHUTILS_PRIME_1;
 }
 
-NS_INLINE uint64_t mix3(const uint64_t h, const uint64_t v)
+METAXXHASHUTILS_INLINE_ATTRS
+uint64_t mix3(const uint64_t h, const uint64_t v)
 {
-  return (h ^ mix2(v, 0)) * PRIME1 + PRIME4;
+  return (h ^ mix2(v, 0)) * METAXXHASHUTILS_PRIME_1 + METAXXHASHUTILS_PRIME_4;
 }
 
-NS_INLINE uint32_t endian32(const char *v)
+METAXXHASHUTILS_INLINE_ATTRS
+uint32_t endian32(const char *v)
 {
   return (uint32_t)((uint8_t)(v[0])) | ((uint32_t)((uint8_t)(v[1])) << 8)
   | ((uint32_t)((uint8_t)(v[2])) << 16) | ((uint32_t)((uint8_t)(v[3])) << 24);
 }
 
-NS_INLINE uint64_t endian64(const char *v)
+METAXXHASHUTILS_INLINE_ATTRS
+uint64_t endian64(const char *v)
 {
   return (uint64_t)((uint8_t)(v[0])) | ((uint64_t)((uint8_t)(v[1])) << 8)
   | ((uint64_t)((uint8_t)(v[2])) << 16) | ((uint64_t)((uint8_t)(v[3])) << 24)
@@ -69,50 +79,58 @@ NS_INLINE uint64_t endian64(const char *v)
   | ((uint64_t)((uint8_t)(v[6])) << 48) | ((uint64_t)((uint8_t)(v[7])) << 56);
 }
 
-NS_INLINE uint64_t fetch64(const char *p, const uint64_t v)
+METAXXHASHUTILS_INLINE_ATTRS
+uint64_t fetch64(const char *p, const uint64_t v)
 {
   return mix2(endian64(p), v);
 }
 
-NS_INLINE uint64_t fetch32(const char *p)
+METAXXHASHUTILS_INLINE_ATTRS
+uint64_t fetch32(const char *p)
 {
-  return (uint64_t)(endian32(p)) * PRIME1;
+  return (uint64_t)(endian32(p)) * METAXXHASHUTILS_PRIME_1;
 }
 
-NS_INLINE uint64_t fetch8(const char *p)
+METAXXHASHUTILS_INLINE_ATTRS
+uint64_t fetch8(const char *p)
 {
-  return (uint8_t)(*p) * PRIME5;
+  return (uint8_t)(*p) * METAXXHASHUTILS_PRIME_5;
 }
 
-NS_INLINE uint64_t finalize(const uint64_t h, const char *p, uint64_t len)
+METAXXHASHUTILS_INLINE_ATTRS
+uint64_t finalize(const uint64_t h, const char *p, uint64_t len)
 {
-  return (len >= 8) ? (finalize(rotl(h ^ fetch64(p, 0), 27) * PRIME1 + PRIME4, p + 8, len - 8))
-  : ((len >= 4) ? (finalize(rotl(h ^ fetch32(p), 23) * PRIME2 + PRIME3, p + 4, len - 4))
-      : ((len > 0) ? (finalize(rotl(h ^ fetch8(p), 11) * PRIME1, p + 1, len - 1))
-          : (mix1(mix1(mix1(h, PRIME2, 33), PRIME3, 29), 1, 32))));
+  return (len >= 8) ? (finalize(rotl(h ^ fetch64(p, 0), 27) * METAXXHASHUTILS_PRIME_1 + METAXXHASHUTILS_PRIME_4, p + 8, len - 8))
+  : ((len >= 4) ? (finalize(rotl(h ^ fetch32(p), 23) * METAXXHASHUTILS_PRIME_2 + METAXXHASHUTILS_PRIME_3, p + 4, len - 4))
+      : ((len > 0) ? (finalize(rotl(h ^ fetch8(p), 11) * METAXXHASHUTILS_PRIME_1, p + 1, len - 1))
+          : (mix1(mix1(mix1(h, METAXXHASHUTILS_PRIME_2, 33), METAXXHASHUTILS_PRIME_3, 29), 1, 32))));
 }
 
-NS_INLINE uint64_t h32bytes_compute(const char *p, uint64_t len, const uint64_t v1, const uint64_t v2, const uint64_t v3, const uint64_t v4)
+METAXXHASHUTILS_INLINE_ATTRS
+uint64_t h32bytes_compute(const char *p, uint64_t len, const uint64_t v1, const uint64_t v2, const uint64_t v3, const uint64_t v4)
 {
   return (len >= 32) ? h32bytes_compute(p + 32, len - 32, fetch64(p, v1), fetch64(p + 8, v2), fetch64(p + 16, v3), fetch64(p + 24, v4))
   : mix3(mix3(mix3(mix3(rotl(v1, 1) + rotl(v2, 7) + rotl(v3, 12) + rotl(v4, 18), v1), v2), v3), v4);
 }
 
-NS_INLINE uint64_t h32bytes(const char *p, uint64_t len, const uint64_t seed)
+METAXXHASHUTILS_INLINE_ATTRS
+uint64_t h32bytes(const char *p, uint64_t len, const uint64_t seed)
 {
-  return h32bytes_compute(p, len, seed + PRIME1 + PRIME2, seed + PRIME2, seed, seed - PRIME1);
+  return h32bytes_compute(p, len, seed + METAXXHASHUTILS_PRIME_1 + METAXXHASHUTILS_PRIME_2, seed + METAXXHASHUTILS_PRIME_2, seed, seed - METAXXHASHUTILS_PRIME_1);
 }
 
 /*
   Primary APIs
  */
 
-NS_INLINE uint64_t meta_xxhash64(const char *p, uint64_t len, uint64_t seed)
+METAXXHASHUTILS_INLINE_ATTRS
+uint64_t meta_xxhash64(const char *p, uint64_t len, uint64_t seed)
 {
-  return finalize((len >= 32 ? h32bytes(p, len, seed) : seed + PRIME5) + len, p + (len & ~0x1FULL), len & 0x1FULL);
+  return finalize((len >= 32 ? h32bytes(p, len, seed) : seed + METAXXHASHUTILS_PRIME_5) + len, p + (len & ~0x1FULL), len & 0x1FULL);
 }
 
-NS_INLINE uint64_t FBxxHash64(const char *p, uint64_t len, uint64_t seed)
+METAXXHASHUTILS_INLINE_ATTRS
+uint64_t FBxxHash64(const char *p, uint64_t len, uint64_t seed)
 {
   return meta_xxhash64(p, len, seed);
 }