diff --git a/paddle/fluid/imperative/layer.cc b/paddle/fluid/imperative/layer.cc
index c0a337a2b5a497e4e65375ff1b6f7f26b73f460d..426644ca9183fd325bf32eb995d57006c1c4b5f0 100644
--- a/paddle/fluid/imperative/layer.cc
+++ b/paddle/fluid/imperative/layer.cc
@@ -27,8 +27,8 @@
 namespace paddle {
 namespace imperative {
 
-const char* PyLayer::kFwdInp = PyLayer::kFwdInp;
-const char* PyLayer::kFwdOut = PyLayer::kFwdOut;
+const char* PyLayer::kFwdInp = "X";
+const char* PyLayer::kFwdOut = "Out";
 
 std::map<int, py::object> py_funcs_;