diff -r 406c6fd7e753 Include/object.h
--- a/Include/object.h	Sun Mar 17 21:53:48 2013 -0400
+++ b/Include/object.h	Sun Mar 17 23:32:41 2013 -0700
@@ -809,6 +809,8 @@
  * Python integers aren't currently weakly referencable.  Best practice is
  * to use Py_CLEAR() even if you can't think of a reason for why you need to.
  */
+
+
 #define Py_CLEAR(op)                            \
     do {                                        \
         if (op) {                               \
@@ -819,9 +821,29 @@
     } while (0)
 
 /* Macros to use in case the object pointer may be NULL: */
+#ifdef OLD_17206
+
 #define Py_XINCREF(op) do { if ((op) == NULL) ; else Py_INCREF(op); } while (0)
 #define Py_XDECREF(op) do { if ((op) == NULL) ; else Py_DECREF(op); } while (0)
 
+#else
+
+#define Py_XINCREF(op)                             \
+    do {                                           \
+        PyObject* _py_tmp=(PyObject*)(op);         \
+        if (_py_tmp != NULL)                       \
+            Py_INCREF(_py_tmp);                    \
+    } while (0)                                    
+
+#define Py_XDECREF(op)                             \
+    do {                                           \
+        PyObject* _py_tmp=(PyObject*)(op);         \
+        if (_py_tmp != NULL)                       \
+            Py_DECREF(_py_tmp);                    \
+    } while (0)
+
+#endif
+
 /*
 These are provided as conveniences to Python runtime embedders, so that
 they can have object code that is not dependent on Python compilation flags.
diff -r 406c6fd7e753 Misc/ACKS
--- a/Misc/ACKS	Sun Mar 17 21:53:48 2013 -0400
+++ b/Misc/ACKS	Sun Mar 17 23:32:41 2013 -0700
@@ -960,6 +960,7 @@
 Remi Pointel
 Ariel Poliak
 Guilherme Polo
+Illia Polosukhin
 Michael Pomraning
 Iustin Pop
 Claudiu Popa
diff -r 406c6fd7e753 Misc/NEWS
--- a/Misc/NEWS	Sun Mar 17 21:53:48 2013 -0400
+++ b/Misc/NEWS	Sun Mar 17 23:32:41 2013 -0700
@@ -10,6 +10,9 @@
 Core and Builtins
 -----------------
 
+- Issue #17206: Py_XDECREF() and Py_XINCREF() now expands their arguments once 
+  instead of multiple times. Patch written by Illia Polosukhin.
+
 - Issue #17434: Properly raise a SyntaxError when a string occurs between future
   imports.