diff --git a/LEGO1/mxcompositepresenter.cpp b/LEGO1/mxcompositepresenter.cpp
index e42dbadb..9bbe594b 100644
--- a/LEGO1/mxcompositepresenter.cpp
+++ b/LEGO1/mxcompositepresenter.cpp
@@ -1,5 +1,9 @@
 #include "mxcompositepresenter.h"
 
+#include "decomp.h"
+
+DECOMP_STATIC_ASSERT(sizeof(MxCompositePresenter) == 76);
+
 // OFFSET: LEGO1 0x100b60b0 STUB
 MxCompositePresenter::MxCompositePresenter()
 {
diff --git a/LEGO1/mxcompositepresenter.h b/LEGO1/mxcompositepresenter.h
index 471f3087..9f517652 100644
--- a/LEGO1/mxcompositepresenter.h
+++ b/LEGO1/mxcompositepresenter.h
@@ -13,7 +13,7 @@ class MxCompositePresenter : public MxPresenter
 
   // OFFSET: LEGO1 0x100b6210
   inline virtual const char *ClassName() const override // vtable+0x0c
-  { 
+  {
     // 0x100f0774
     return "MxCompositePresenter";
   }
@@ -24,6 +24,9 @@ class MxCompositePresenter : public MxPresenter
     return !strcmp(name, MxCompositePresenter::ClassName()) || MxPresenter::IsA(name);
   }
 
+  undefined m_unk40;
+  undefined4 *m_unk44;
+  undefined4 m_unk48;
 };
 
 #endif // MXCOMPOSITEPRESENTER_H