diff --git a/Libraries/FBReactNativeSpec/FBReactNativeSpec/FBReactNativeSpec.h b/Libraries/FBReactNativeSpec/FBReactNativeSpec/FBReactNativeSpec.h
index 717a8fc7116..7eed174102d 100644
--- a/Libraries/FBReactNativeSpec/FBReactNativeSpec/FBReactNativeSpec.h
+++ b/Libraries/FBReactNativeSpec/FBReactNativeSpec/FBReactNativeSpec.h
@@ -1598,7 +1598,7 @@ namespace JS {
           requestId:(double)requestId
             headers:(NSArray *)headers
                data:(NSDictionary *)data
-       responseType:(NSDictionary *)responseType
+       responseType:(NSString *)responseType
 useIncrementalUpdates:(BOOL)useIncrementalUpdates
             timeout:(double)timeout
     withCredentials:(BOOL)withCredentials;
diff --git a/Libraries/Network/NativeNetworkingAndroid.js b/Libraries/Network/NativeNetworkingAndroid.js
index 573090d7d26..3d65967736d 100644
--- a/Libraries/Network/NativeNetworkingAndroid.js
+++ b/Libraries/Network/NativeNetworkingAndroid.js
@@ -22,7 +22,7 @@ export interface Spec extends TurboModule {
     requestId: number,
     headers: Array<Header>,
     data: Object,
-    responseType: Object, // TODO: Use stricter type.
+    responseType: string,
     useIncrementalUpdates: boolean,
     timeout: number,
     withCredentials: boolean,
diff --git a/ReactAndroid/src/main/java/com/facebook/fbreact/specs/NativeNetworkingAndroidSpec.java b/ReactAndroid/src/main/java/com/facebook/fbreact/specs/NativeNetworkingAndroidSpec.java
index bdeb3ed49e4..22a46d4898d 100644
--- a/ReactAndroid/src/main/java/com/facebook/fbreact/specs/NativeNetworkingAndroidSpec.java
+++ b/ReactAndroid/src/main/java/com/facebook/fbreact/specs/NativeNetworkingAndroidSpec.java
@@ -37,8 +37,8 @@ public abstract class NativeNetworkingAndroidSpec extends ReactContextBaseJavaMo
 
   @ReactMethod
   public abstract void sendRequest(String method, String url, double requestId,
-      ReadableArray headers, ReadableMap data, ReadableMap responseType,
-      boolean useIncrementalUpdates, double timeout, boolean withCredentials);
+      ReadableArray headers, ReadableMap data, String responseType, boolean useIncrementalUpdates,
+      double timeout, boolean withCredentials);
 
   @ReactMethod
   public abstract void addListener(String eventName);