diff --git a/src/common/serialization/clap/host.h b/src/common/serialization/clap/host.h
index 1530d595..cee25380 100644
--- a/src/common/serialization/clap/host.h
+++ b/src/common/serialization/clap/host.h
@@ -24,6 +24,7 @@
 #include <clap/plugin.h>
 
 #include "../../bitsery/ext/in-place-optional.h"
+#include "../common.h"
 
 // Serialization messages for `clap/host.h`
 
@@ -94,5 +95,36 @@ struct SupportedHostExtensions {
     }
 };
 
+/**
+ * Message struct for `clap_host::request_restart()`.
+ */
+struct RequestRestart {
+    using Response = Ack;
+
+    native_size_t owner_instance_id;
+
+    template <typename S>
+    void serialize(S& s) {
+        s.value8b(owner_instance_id);
+    }
+};
+
+/**
+ * Message struct for `clap_host::request_process()`.
+ */
+struct RequestProcess {
+    using Response = Ack;
+
+    native_size_t owner_instance_id;
+
+    template <typename S>
+    void serialize(S& s) {
+        s.value8b(owner_instance_id);
+    }
+};
+
+// `clap_host::request_callback()` is of course handled entirely on the Wine
+// plugin host side
+
 }  // namespace host
 }  // namespace clap