Add missing decref.
diff --git a/Objects/abstract.c b/Objects/abstract.c
index b981001..024f97d 100644
--- a/Objects/abstract.c
+++ b/Objects/abstract.c
@@ -1439,6 +1439,7 @@
 			if (n < oldn) {
 				/* Check for overflow */
 				PyErr_NoMemory();
+				Py_DECREF(item);
 				goto Fail; 
 			}
 			if (_PyTuple_Resize(&result, n) != 0) {