diff --git a/LEGO1/mxaudiopresenter.cpp b/LEGO1/mxaudiopresenter.cpp
index b15c2556..dcb43b86 100644
--- a/LEGO1/mxaudiopresenter.cpp
+++ b/LEGO1/mxaudiopresenter.cpp
@@ -1 +1,5 @@
 #include "mxaudiopresenter.h"
+
+#include "decomp.h"
+
+DECOMP_STATIC_ASSERT(sizeof(MxAudioPresenter) == 84);
diff --git a/LEGO1/mxaudiopresenter.h b/LEGO1/mxaudiopresenter.h
index b23eefe9..c1001a13 100644
--- a/LEGO1/mxaudiopresenter.h
+++ b/LEGO1/mxaudiopresenter.h
@@ -7,9 +7,13 @@
 class MxAudioPresenter : public MxMediaPresenter
 {
 public:
+  MxAudioPresenter() {
+    m_unk50 = 100;
+  }
+
   // OFFSET: LEGO1 0x1000d280
   inline virtual const char *ClassName() const override // vtable+0x0c
-  { 
+  {
     // 0x100f078c
     return "MxAudioPresenter";
   }
@@ -19,6 +23,8 @@ class MxAudioPresenter : public MxMediaPresenter
   {
     return !strcmp(name, MxAudioPresenter::ClassName()) || MxMediaPresenter::IsA(name);
   }
+
+  int m_unk50;
 };
 
 #endif // MXAUDIOPRESENTER_H