diff --git a/samples/ffi/http/lib/fake_http.cc b/samples/ffi/http/lib/fake_http.cc
index 21a29875bd5..63b4f1d3853 100644
--- a/samples/ffi/http/lib/fake_http.cc
+++ b/samples/ffi/http/lib/fake_http.cc
@@ -34,7 +34,7 @@ Content-Type: text/html; charset=UTF-8
 DART_EXPORT void http_get(const char* uri, void (*onResponse)(const char*)) {
   std::thread([onResponse]() {
     std::this_thread::sleep_for(std::chrono::seconds(3));
-    onResponse(strdup(kExampleResponse));
+    onResponse(kExampleResponse);
   }).detach();
 }
 
@@ -42,7 +42,7 @@ DART_EXPORT void http_serve(void (*onRequest)(const char*)) {
   std::thread([onRequest]() {
     while (true) {
       std::this_thread::sleep_for(std::chrono::seconds(1));
-      onRequest(strdup(kExampleRequest));
+      onRequest(kExampleRequest);
     }
   }).detach();
 }
diff --git a/samples/ffi/http/lib/http.dart b/samples/ffi/http/lib/http.dart
index 1fde486f72c..0ce55c2ede4 100644
--- a/samples/ffi/http/lib/http.dart
+++ b/samples/ffi/http/lib/http.dart
@@ -17,7 +17,6 @@ Future<String> httpGet(String uri) async {
   final completer = Completer<String>();
   void onResponse(Pointer<Utf8> responsePointer) {
     completer.complete(responsePointer.toDartString());
-    calloc.free(responsePointer);
   }
 
   final callback = NativeCallable<HttpCallback>.listener(onResponse);
@@ -44,7 +43,6 @@ void httpServe(void Function(String) onRequest) {
   // Create the NativeCallable.listener.
   void onNativeRequest(Pointer<Utf8> requestPointer) {
     onRequest(requestPointer.toDartString());
-    calloc.free(requestPointer);
   }
 
   final callback = NativeCallable<HttpCallback>.listener(onNativeRequest);