diff --git a/src/if_py_both.h b/src/if_py_both.h
index 1cb8f99..29d2820 100644
--- a/src/if_py_both.h
+++ b/src/if_py_both.h
@@ -814,6 +814,7 @@
     static PyObject *
 IterIter(PyObject *self)
 {
+    Py_INCREF(self);
     return self;
 }