diff --git a/src/sound/SESound.cpp b/src/sound/SESound.cpp
index ee6c5f9..ab2766a 100644
--- a/src/sound/SESound.cpp
+++ b/src/sound/SESound.cpp
@@ -6,6 +6,7 @@
 
 int32_t SESound::s_Initialized;
 FMOD::System* SESound::s_pGameSystem;
+uint32_t SESound::s_UniqueID;
 
 void* FSoundAllocCallback(uint32_t size, FMOD_MEMORY_TYPE type, const char* sourcestr) {
     return SMemAlloc(size, "FMod", 0, 0x8);
diff --git a/src/sound/SESound.hpp b/src/sound/SESound.hpp
index bca1b7f..37a34cb 100644
--- a/src/sound/SESound.hpp
+++ b/src/sound/SESound.hpp
@@ -10,6 +10,7 @@ class SESound {
         // Static variables
         static int32_t s_Initialized;
         static FMOD::System* s_pGameSystem;
+        static uint32_t s_UniqueID;
 
         // Static functions
         static FMOD::SoundGroup* CreateSoundGroup(const char* name, int32_t maxAudible);