diff --git a/src/__stl__.h b/src/__stl__.h
index 24bd6d60..b80453c7 100644
--- a/src/__stl__.h
+++ b/src/__stl__.h
@@ -3,6 +3,7 @@
 #ifdef _MSC_VER
 #pragma warning (disable:4267)
 #pragma warning (disable:4244)
+#pragma warning (disable:4101)
 #define _CRT_NONSTDC_NO_DEPRECATE
 #endif
 
diff --git a/src/obj.h b/src/obj.h
index 0fb8ac6e..6924eac6 100644
--- a/src/obj.h
+++ b/src/obj.h
@@ -5,8 +5,8 @@
 typedef int64_t _Int;
 typedef double _Float;
 
-class CodeObject;
-class BasePointer;
+struct CodeObject;
+struct BasePointer;
 class VM;
 class Frame;
 
diff --git a/src/safestl.h b/src/safestl.h
index 313ad60d..d193e29d 100644
--- a/src/safestl.h
+++ b/src/safestl.h
@@ -3,7 +3,7 @@
 #include "__stl__.h"
 #include "str.h"
 
-class PyObject;
+struct PyObject;
 typedef std::shared_ptr<PyObject> PyVar;
 typedef PyVar PyVarOrNull;