diff --git a/src/core/jsproxy.c b/src/core/jsproxy.c
index 037d0460b..0cdc21c27 100644
--- a/src/core/jsproxy.c
+++ b/src/core/jsproxy.c
@@ -74,9 +74,9 @@ JsProxy_GetAttr(PyObject* self, PyObject* attr)
   PyErr_Clear();
 
   bool success = false;
-  JsRef idresult;
+  JsRef idresult = 0;
   // result:
-  PyObject* pyresult;
+  PyObject* pyresult = NULL;
 
   const char* key = PyUnicode_AsUTF8(attr);
   FAIL_IF_NULL(key);