diff --git a/src/_wrappers.c b/src/_wrappers.c
index b6eeaca..d920357 100644
--- a/src/_wrappers.c
+++ b/src/_wrappers.c
@@ -1117,6 +1117,11 @@ static int WraptObjectProxy_set_wrapped(WraptObjectProxyObject *self,
       return -1;
     }
 
+    if (!value) {
+        PyErr_SetString(PyExc_TypeError, "__wrapped__ must be an object");
+        return -1;
+    }
+
     Py_INCREF(value);
     Py_DECREF(self->wrapped);