diff --git a/LEGO1/mxpresenter.cpp b/LEGO1/mxpresenter.cpp
index 893de60d..b7bfd7c4 100644
--- a/LEGO1/mxpresenter.cpp
+++ b/LEGO1/mxpresenter.cpp
@@ -1,5 +1,9 @@
 #include "mxpresenter.h"
 
+#include "decomp.h"
+
+DECOMP_STATIC_ASSERT(sizeof(MxPresenter) == 64);
+
 // OFFSET: LEGO1 0x1000bee0 STUB
 void MxPresenter::DoneTickle()
 {
diff --git a/LEGO1/mxpresenter.h b/LEGO1/mxpresenter.h
index 6ea022da..f22eda01 100644
--- a/LEGO1/mxpresenter.h
+++ b/LEGO1/mxpresenter.h
@@ -5,20 +5,17 @@
 
 #include "mxcriticalsection.h"
 
+#include "decomp.h"
+
 class MxStreamController;
 class MxDSAction;
 
-#ifndef undefined4
-#define undefined4 int
-#endif
-
-#ifndef undefined
-#define undefined int
-#endif
-
 class MxPresenter : public MxCore
 {
 public:
+  MxPresenter() {
+    Init();
+  }
   __declspec(dllexport) virtual ~MxPresenter(); // vtable+0x0
 
   // OFFSET: LEGO1 0x1000bfe0