diff --git a/Modules/symtablemodule.c b/Modules/symtablemodule.c
index 60f9ba9..15c0f92 100644
--- a/Modules/symtablemodule.c
+++ b/Modules/symtablemodule.c
@@ -52,6 +52,9 @@
 {
     PyObject *m;
 
+    if (PyType_Ready(&PySTEntry_Type) < 0)
+        return;
+
     m = Py_InitModule("_symtable", symtable_methods);
     if (m == NULL)
         return;