diff --git a/packages/react-native/Libraries/Network/RCTNetworking.android.js b/packages/react-native/Libraries/Network/RCTNetworking.android.js
index a83bd28a971862..a957a09a4a2c6c 100644
--- a/packages/react-native/Libraries/Network/RCTNetworking.android.js
+++ b/packages/react-native/Libraries/Network/RCTNetworking.android.js
@@ -59,7 +59,7 @@ const RCTNetworking = {
 
   sendRequest(
     method: string,
-    trackingName: ?string,
+    trackingName: string | void,
     url: string,
     headers: Object,
     data: RequestBody,
diff --git a/packages/react-native/Libraries/Network/RCTNetworking.ios.js b/packages/react-native/Libraries/Network/RCTNetworking.ios.js
index 40035ff1f6aeb1..dcabadec9fdb5f 100644
--- a/packages/react-native/Libraries/Network/RCTNetworking.ios.js
+++ b/packages/react-native/Libraries/Network/RCTNetworking.ios.js
@@ -29,7 +29,7 @@ const RCTNetworking = {
 
   sendRequest(
     method: string,
-    trackingName: ?string,
+    trackingName: string | void,
     url: string,
     headers: {...},
     data: RequestBody,
diff --git a/packages/react-native/Libraries/Network/RCTNetworking.js.flow b/packages/react-native/Libraries/Network/RCTNetworking.js.flow
index 59e4a0b3924d58..a5dab051943396 100644
--- a/packages/react-native/Libraries/Network/RCTNetworking.js.flow
+++ b/packages/react-native/Libraries/Network/RCTNetworking.js.flow
@@ -25,7 +25,7 @@ declare const RCTNetworking: interface {
 
   sendRequest(
     method: string,
-    trackingName: ?string,
+    trackingName: string | void,
     url: string,
     headers: {...},
     data: RequestBody,
diff --git a/packages/react-native/Libraries/Network/XMLHttpRequest.js b/packages/react-native/Libraries/Network/XMLHttpRequest.js
index 9208f614fb0f55..d963e07a474154 100644
--- a/packages/react-native/Libraries/Network/XMLHttpRequest.js
+++ b/packages/react-native/Libraries/Network/XMLHttpRequest.js
@@ -170,7 +170,7 @@ class XMLHttpRequest extends EventTarget {
   _sent: boolean;
   _url: ?string = null;
   _timedOut: boolean = false;
-  _trackingName: string | void = undefined;
+  _trackingName: ?string;
   _incrementalEvents: boolean = false;
   _startTime: ?number = null;
   _performanceLogger: IPerformanceLogger = GlobalPerformanceLogger;
@@ -534,7 +534,7 @@ class XMLHttpRequest extends EventTarget {
   /**
    * Custom extension for tracking origins of request.
    */
-  setTrackingName(trackingName: string | void): XMLHttpRequest {
+  setTrackingName(trackingName: ?string): XMLHttpRequest {
     this._trackingName = trackingName;
     return this;
   }
@@ -632,7 +632,7 @@ class XMLHttpRequest extends EventTarget {
       );
       RCTNetworking.sendRequest(
         this._method,
-        this._trackingName,
+        this._trackingName ?? undefined,
         this._url,
         this._headers,
         data,
diff --git a/packages/react-native/Libraries/__tests__/__snapshots__/public-api-test.js.snap b/packages/react-native/Libraries/__tests__/__snapshots__/public-api-test.js.snap
index a4ca1c0951ae9f..cf3cda189433e5 100644
--- a/packages/react-native/Libraries/__tests__/__snapshots__/public-api-test.js.snap
+++ b/packages/react-native/Libraries/__tests__/__snapshots__/public-api-test.js.snap
@@ -5916,7 +5916,7 @@ exports[`public API should not change unintentionally Libraries/Network/RCTNetwo
   ): EventSubscription,
   sendRequest(
     method: string,
-    trackingName: ?string,
+    trackingName: string | void,
     url: string,
     headers: { ... },
     data: RequestBody,
@@ -6010,7 +6010,7 @@ declare class XMLHttpRequest extends EventTarget {
   getAllResponseHeaders(): ?string;
   getResponseHeader(header: string): ?string;
   setRequestHeader(header: string, value: any): void;
-  setTrackingName(trackingName: string | void): XMLHttpRequest;
+  setTrackingName(trackingName: ?string): XMLHttpRequest;
   setPerformanceLogger(performanceLogger: IPerformanceLogger): XMLHttpRequest;
   open(method: string, url: string, async: ?boolean): void;
   send(data: any): void;