diff --git a/packages/react-native/React/I18n/RCTLocalizedString.h b/packages/react-native/React/I18n/RCTLocalizedString.h
index a190fccdab2..68c48bd6775 100644
--- a/packages/react-native/React/I18n/RCTLocalizedString.h
+++ b/packages/react-native/React/I18n/RCTLocalizedString.h
@@ -14,6 +14,10 @@
 
 #import <React/FBXXHashUtils.h>
 
+#ifdef __cplusplus
+extern "C" {
+#endif
+
 uint64_t FBcoreLocalexxHash48(const char *input, uint64_t length, uint64_t seed);
 NSString *RCTLocalizedStringFromKey(uint64_t key, NSString *defaultValue);
 
@@ -23,4 +27,8 @@ NSString *RCTLocalizedStringFromKey(uint64_t key, NSString *defaultValue);
 #define RCTLocalizedString(string, description) \
   RCTLocalizedStringFromKey(RCTLocalizedStringKey(string, description), @"" string)
 
+#ifdef __cplusplus
+}
+#endif
+
 #endif
diff --git a/packages/react-native/React/I18n/RCTLocalizedString.mm b/packages/react-native/React/I18n/RCTLocalizedString.mm
index ae2e05dd276..6a09613b77a 100644
--- a/packages/react-native/React/I18n/RCTLocalizedString.mm
+++ b/packages/react-native/React/I18n/RCTLocalizedString.mm
@@ -9,6 +9,8 @@
 
 #if !defined(WITH_FBI18N) || !(WITH_FBI18N)
 
+extern "C" {
+
 static NSString *FBTStringByConvertingIntegerToBase64(uint64_t number)
 {
   const NSUInteger base = 64;
@@ -39,4 +41,6 @@ NSString *RCTLocalizedStringFromKey(uint64_t key, NSString *defaultValue)
     return [bundle localizedStringForKey:FBTStringByConvertingIntegerToBase64(key) value:defaultValue table:nil];
   }
 }
+}
+
 #endif