diff --git a/Services/Compositor/CompositorWebContentServer.ipc b/Services/Compositor/CompositorWebContentServer.ipc
index cbc5e35e9e..0795f319d9 100644
--- a/Services/Compositor/CompositorWebContentServer.ipc
+++ b/Services/Compositor/CompositorWebContentServer.ipc
@@ -13,6 +13,8 @@
 
 endpoint CompositorWebContentServer
 {
+    init_transport(int peer_pid) => (int compositor_pid)
+
     set_presentation_mode(Web::Compositor::CompositorContextId context_id, Web::Compositor::PresentationMode presentation_mode) =|
     destroy_context(Web::Compositor::CompositorContextId context_id) =|
 
diff --git a/Services/Compositor/ConnectionFromWebContent.cpp b/Services/Compositor/ConnectionFromWebContent.cpp
index c0b1adfd8a..2deadda1a0 100644
--- a/Services/Compositor/ConnectionFromWebContent.cpp
+++ b/Services/Compositor/ConnectionFromWebContent.cpp
@@ -5,6 +5,7 @@
  */
 
 #include <Compositor/ConnectionFromWebContent.h>
+#include <LibCore/System.h>
 #include <LibWeb/Page/InputEvent.h>
 
 namespace Compositor {
@@ -28,6 +29,15 @@ void ConnectionFromWebContent::notify_compositor_lost()
     async_did_lose_compositor();
 }
 
+Messages::CompositorWebContentServer::InitTransportResponse ConnectionFromWebContent::init_transport([[maybe_unused]] int peer_pid)
+{
+#ifdef AK_OS_WINDOWS
+    m_transport->set_peer_pid(peer_pid);
+    return Core::System::getpid();
+#endif
+    VERIFY_NOT_REACHED();
+}
+
 void ConnectionFromWebContent::request_rendering_update()
 {
     async_request_rendering_update();
diff --git a/Services/Compositor/ConnectionFromWebContent.h b/Services/Compositor/ConnectionFromWebContent.h
index 74c96164d4..9b4776a3bc 100644
--- a/Services/Compositor/ConnectionFromWebContent.h
+++ b/Services/Compositor/ConnectionFromWebContent.h
@@ -31,6 +31,7 @@ private:
 
     virtual void die() override;
 
+    virtual Messages::CompositorWebContentServer::InitTransportResponse init_transport(int peer_pid) override;
     virtual void set_presentation_mode(Web::Compositor::CompositorContextId, Web::Compositor::PresentationMode) override;
     virtual void destroy_context(Web::Compositor::CompositorContextId) override;
     virtual void update_display_list(Web::Compositor::CompositorContextId, NonnullRefPtr<Web::Painting::DisplayList>, Web::Painting::AccumulatedVisualContextTree, Web::Painting::DisplayListResourceTransaction, Web::Painting::ScrollStateSnapshot) override;
diff --git a/Services/WebContent/ConnectionFromClient.cpp b/Services/WebContent/ConnectionFromClient.cpp
index a6043606a2..c71789ec51 100644
--- a/Services/WebContent/ConnectionFromClient.cpp
+++ b/Services/WebContent/ConnectionFromClient.cpp
@@ -201,6 +201,14 @@ void ConnectionFromClient::connect_to_compositor_process(IPC::TransportHandle ha
     m_compositor_connection->on_mouse_event = [this](u64 page_id, Web::MouseEvent event) {
         mouse_event(page_id, move(event));
     };
+
+#ifdef AK_OS_WINDOWS
+    // Perform Windows peer PID handshake before any other IPC
+    if constexpr (requires { m_compositor_connection->transport().set_peer_pid(0); }) {
+        auto response = m_compositor_connection->send_sync<Messages::CompositorWebContentServer::InitTransport>(Core::System::getpid());
+        m_compositor_connection->transport().set_peer_pid(response->compositor_pid());
+    }
+#endif
 }
 
 void ConnectionFromClient::compositor_process_reconnected()