diff --git a/LEGO1/legoeventnotificationparam.h b/LEGO1/legoeventnotificationparam.h
index 5f0195ec..c9087909 100644
--- a/LEGO1/legoeventnotificationparam.h
+++ b/LEGO1/legoeventnotificationparam.h
@@ -4,6 +4,8 @@
 #include "mxnotificationparam.h"
 #include "mxtypes.h"
 
+#include <stdlib.h>
+
 // VTABLE: LEGO1 0x100d6aa0
 class LegoEventNotificationParam : public MxNotificationParam {
 public:
diff --git a/LEGO1/legogamestate.cpp b/LEGO1/legogamestate.cpp
index 62a30db4..d1706c1e 100644
--- a/LEGO1/legogamestate.cpp
+++ b/LEGO1/legogamestate.cpp
@@ -9,6 +9,8 @@
 #include "mxstring.h"
 #include "mxvariabletable.h"
 
+#include <stdio.h>
+
 // Based on the highest dword offset (0x42c) referenced in the constructor.
 // There may be other members that come after.
 DECOMP_SIZE_ASSERT(LegoGameState, 0x430)
diff --git a/LEGO1/viewmanager/viewlodlist.h b/LEGO1/viewmanager/viewlodlist.h
index c0d5ed82..4d848533 100644
--- a/LEGO1/viewmanager/viewlodlist.h
+++ b/LEGO1/viewmanager/viewlodlist.h
@@ -6,6 +6,8 @@
 #include "assert.h"
 #include "compat.h"
 
+#include <string.h>
+
 #pragma warning(disable : 4237)
 #pragma warning(disable : 4786)