diff --git a/Include/genobject.h b/Include/genobject.h
index 13a3856..e7a1c01 100644
--- a/Include/genobject.h
+++ b/Include/genobject.h
@@ -11,20 +11,20 @@
 struct _frame; /* Avoid including frameobject.h */
 
 typedef struct {
-        PyObject_HEAD
-        /* The gi_ prefix is intended to remind of generator-iterator. */
+    PyObject_HEAD
+    /* The gi_ prefix is intended to remind of generator-iterator. */
 
-        /* Note: gi_frame can be NULL if the generator is "finished" */
-        struct _frame *gi_frame;
+    /* Note: gi_frame can be NULL if the generator is "finished" */
+    struct _frame *gi_frame;
 
-        /* True if generator is being executed. */
-        int gi_running;
+    /* True if generator is being executed. */
+    int gi_running;
     
-        /* The code object backing the generator */
-        PyObject *gi_code;
+    /* The code object backing the generator */
+    PyObject *gi_code;
 
-        /* List of weak reference. */
-        PyObject *gi_weakreflist;
+    /* List of weak reference. */
+    PyObject *gi_weakreflist;
 } PyGenObject;
 
 PyAPI_DATA(PyTypeObject) PyGen_Type;