diff --git a/src/main.cpp b/src/main.cpp
index 81c04bb..858efc1 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -110,6 +110,35 @@ static const ext_session_lock_v1_listener lock_listener = {
     .finished = lock_handle_finished,
 };
 
+static void lock_surface_handle_configure(
+    void* data,
+    ext_session_lock_surface_v1* lock_surface,
+    uint32_t serial,
+    uint32_t width,
+    uint32_t height)
+{
+    auto& out = *static_cast<state::Output*>(data);
+    
+    // MUST acknowledge the configure
+    ext_session_lock_surface_v1_ack_configure(lock_surface, serial);
+    
+    out.surface_width = width;
+    out.surface_height = height;
+    out.configured = true;
+    
+    spdlog::info("Lock surface configured: {}x{}", width, height);
+    
+    // TODO: Create EGL surface here with these dimensions
+    // TODO: Render first frame
+    
+    // For now, just commit an empty surface
+    wl_surface_commit(out.wl_out_surface);
+}
+
+static const ext_session_lock_surface_v1_listener lock_surface_listener = {
+    .configure = lock_surface_handle_configure,
+};
+
 
 int main (int argc, char *argv[]) {
   std::shared_ptr<state::LockScreenState> application_state = std::make_shared<state::LockScreenState>();