diff --git a/plugins/devel/check-structures-sanity.cpp b/plugins/devel/check-structures-sanity.cpp
index 021a8c14c..eaeb97e66 100644
--- a/plugins/devel/check-structures-sanity.cpp
+++ b/plugins/devel/check-structures-sanity.cpp
@@ -4,6 +4,14 @@
 #include "DataDefs.h"
 #include "DataIdentity.h"
 
+#if defined(WIN32) && defined(DFHACK64)
+#define _WIN32_WINNT 0x0501
+#define WINVER 0x0501
+
+#define WIN32_LEAN_AND_MEAN
+#include <winnt.h>
+#endif
+
 #include <set>
 #include <typeinfo>
 
@@ -108,7 +116,7 @@ Checker::Scope::Scope(Checker *parent, const std::string & name) :
 }
 
 Checker::Scope::Scope(Checker *parent, size_t index) :
-    Scope(parent, stl_sprintf("[%lu]", index))
+    Scope(parent, stl_sprintf("[%zu]", index))
 {
 }
 
diff --git a/plugins/devel/memview.cpp b/plugins/devel/memview.cpp
index 5019ac637..429fec409 100644
--- a/plugins/devel/memview.cpp
+++ b/plugins/devel/memview.cpp
@@ -76,7 +76,7 @@ void outputHex(uint8_t *buf,uint8_t *lbuf,size_t len,size_t start,color_ostream
     for(size_t i=0;i<len;i+=page_size)
     {
         //con.gotoxy(1,i/page_size+1);
-        con.print("0x%08lX ",i+start);
+        con.print("0x%08zX ",i+start);
         for(size_t j=0;(j<page_size) && (i+j<len);j++)
             {
                 if(j%sizeof(void*)==0)