diff --git a/Modules/symtablemodule.c b/Modules/symtablemodule.c
index f6201e5..02a81f1 100644
--- a/Modules/symtablemodule.c
+++ b/Modules/symtablemodule.c
@@ -63,6 +63,9 @@
 {
     PyObject *m;
 
+    if (PyType_Ready(&PySTEntry_Type) < 0)
+        return NULL;
+
     m = PyModule_Create(&symtablemodule);
     if (m == NULL)
         return NULL;