1 files changed, 10 insertions, 3 deletions
diff --git a/Modules/_asynciomodule.c b/Modules/_asynciomodule.c
index b8a88e6..b998a04 100644
--- a/Modules/_asynciomodule.c
+++ b/Modules/_asynciomodule.c
@@ -532,9 +532,16 @@ _asyncio_Future_remove_done_callback(FutureObj *self, PyObject *fn)
             goto fail;
         }
         if (ret == 0) {
-            Py_INCREF(item);
-            PyList_SET_ITEM(newlist, j, item);
-            j++;
+            if (j < len) {
+                Py_INCREF(item);
+                PyList_SET_ITEM(newlist, j, item);
+                j++;
+            }
+            else {
+                if (PyList_Append(newlist, item)) {
+                    goto fail;
+                }
+            }
         }
     }