diff --git a/packages/react-native/React/CxxBridge/NSDataBigString.mm b/packages/react-native/React/CxxBridge/NSDataBigString.mm
index 1c26bae624fa73..620d97ecf3b0a8 100644
--- a/packages/react-native/React/CxxBridge/NSDataBigString.mm
+++ b/packages/react-native/React/CxxBridge/NSDataBigString.mm
@@ -34,8 +34,8 @@
 
 NSDataBigString::NSDataBigString(NSData *data)
 {
+  m_length = [data length];
   m_data = ensureNullTerminated(data);
-  m_length = MAX([m_data length], 1) - 1;
 }
 
 } // namespace facebook::react