diff --git a/CHANGELOG.md b/CHANGELOG.md
index d2eba07..7d89652 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -49,6 +49,14 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   per-operation mock selections are untouched. (`devview-networkmock-core`,
   `devview-networkmock`, #90)
 
+### Changed
+- **Breaking:** `MockHttpClientCall` is now `internal` instead of `public` — it was only public
+  because Ktor's `HttpClientCall(client)` base constructor required it to be instantiable from
+  the plugin's install code, not because integrators have a legitimate reason to construct it
+  themselves. Its `rawContent` override already depends on the `@InternalAPI`-annotated Ktor
+  API, so staying public compounded that instability onto this library's own tracked surface.
+  (`devview-networkmock-ktor`, #89)
+
 ### Fixed
 - NetworkMock: replaced ~35 unconditional `println` calls in `MockConfigRepository` and
   `NetworkMockPlugin` with gated [Kermit](https://github.com/touchlab/Kermit) logging
diff --git a/devview-networkmock-ktor/CLAUDE.md b/devview-networkmock-ktor/CLAUDE.md
index 89baa5e..512d830 100644
--- a/devview-networkmock-ktor/CLAUDE.md
+++ b/devview-networkmock-ktor/CLAUDE.md
@@ -25,7 +25,6 @@ val client = HttpClient(OkHttp) {
 
 - `NetworkMockPlugin` — the `HttpClientPlugin<NetworkMockConfig, NetworkMockPluginConfig>` singleton (`NetworkMockPlugin.kt`)
 - `NetworkMockConfig` — DSL receiver; exposes `mockRepository` and `stateRepository` as nullable vars, plus `random: Random` (defaults to `Random.Default`) used for the `x-devview.failureRate` roll — override in tests to pin the outcome (`NetworkMockConfig.kt`)
-- `MockHttpClientCall` — public subclass of `HttpClientCall` that wraps synthetic request/response data without touching the network (`NetworkMockPlugin.kt`)
 
 ## Interception Flow
 
diff --git a/devview-networkmock-ktor/api/api.txt b/devview-networkmock-ktor/api/api.txt
index 749649d..91a1a31 100644
--- a/devview-networkmock-ktor/api/api.txt
+++ b/devview-networkmock-ktor/api/api.txt
@@ -1,11 +1,6 @@
 // Signature format: 4.0
 package com.worldline.devview.networkmock.ktor.plugin {
 
-  public final class MockHttpClientCall extends io.ktor.client.call.HttpClientCall {
-    ctor public MockHttpClientCall(io.ktor.client.HttpClient client);
-    ctor public MockHttpClientCall(io.ktor.client.HttpClient client, io.ktor.client.request.HttpRequestData mockRequestData, io.ktor.client.request.HttpResponseData mockResponseData);
-  }
-
   public final class NetworkMockConfig {
     ctor public NetworkMockConfig();
     method @InaccessibleFromKotlin public com.worldline.devview.networkmock.core.repository.MockConfigRepository? getMockRepository();
diff --git a/devview-networkmock-ktor/src/commonMain/kotlin/com/worldline/devview/networkmock/ktor/plugin/NetworkMockPlugin.kt b/devview-networkmock-ktor/src/commonMain/kotlin/com/worldline/devview/networkmock/ktor/plugin/NetworkMockPlugin.kt
index 408839d..3827c6f 100644
--- a/devview-networkmock-ktor/src/commonMain/kotlin/com/worldline/devview/networkmock/ktor/plugin/NetworkMockPlugin.kt
+++ b/devview-networkmock-ktor/src/commonMain/kotlin/com/worldline/devview/networkmock/ktor/plugin/NetworkMockPlugin.kt
@@ -428,8 +428,8 @@ private fun createMockHttpClientCall(
  * a synthetic response. Both [request] and [response] are set immediately in
  * the secondary constructor so the call is fully usable upon creation.
  */
-public class MockHttpClientCall(client: HttpClient) : HttpClientCall(client) {
-    public constructor(
+internal class MockHttpClientCall(client: HttpClient) : HttpClientCall(client) {
+    constructor(
         client: HttpClient,
         mockRequestData: HttpRequestData,
         mockResponseData: HttpResponseData