diff --git a/Include/Python.h b/Include/Python.h
index 26d2211..9379c66 100644
--- a/Include/Python.h
+++ b/Include/Python.h
@@ -86,6 +86,7 @@
 #include "listobject.h"
 #include "dictobject.h"
 #include "enumobject.h"
+#include "setobject.h"
 #include "methodobject.h"
 #include "moduleobject.h"
 #include "funcobject.h"
diff --git a/Include/setobject.h b/Include/setobject.h
new file mode 100644
index 0000000..eeffa8a
--- /dev/null
+++ b/Include/setobject.h
@@ -0,0 +1,26 @@
+
+/* Set object interface */
+
+#ifndef Py_SETOBJECT_H
+#define Py_SETOBJECT_H
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*
+This data structure is shared by set and frozenset objects.
+*/
+
+typedef struct {
+	PyObject_HEAD
+	PyObject *data;
+	long hash;	/* only used by frozenset objects */
+} PySetObject;
+
+PyAPI_DATA(PyTypeObject) PySet_Type;
+PyAPI_DATA(PyTypeObject) PyFrozenSet_Type;
+
+#ifdef __cplusplus
+}
+#endif
+#endif /* !Py_SETOBJECT_H */