diff --git a/src/sound/SI2.cpp b/src/sound/SI2.cpp
index 14189b8..2435b06 100644
--- a/src/sound/SI2.cpp
+++ b/src/sound/SI2.cpp
@@ -208,6 +208,10 @@ void SI2::InitSoundKitGroups() {
     }
 }
 
+void SI2::PlayUISound(int32_t id) {
+    // TODO
+}
+
 void SI2::RegisterCVars() {
     CVar::Register(
         "StartTalkingDelay",
diff --git a/src/sound/SI2.hpp b/src/sound/SI2.hpp
index 20644b9..3d392f2 100644
--- a/src/sound/SI2.hpp
+++ b/src/sound/SI2.hpp
@@ -23,6 +23,7 @@ class SI2 {
         static int32_t Init(int32_t a1);
         static void InitSoundKitDefs();
         static void InitSoundKitGroups();
+        static void PlayUISound(int32_t id);
         static void RegisterCVars();
         static void RegisterScriptFunctions();
 };