diff --git a/include/wrapping_dap_chain_datum_tx.h b/include/wrapping_dap_chain_datum_tx.h
index 9da07a606d945ef1ce27caf30f6eb6d29f1e0115..fae87f1bba74186ec050b70ae1137431ba6397f7 100644
--- a/include/wrapping_dap_chain_datum_tx.h
+++ b/include/wrapping_dap_chain_datum_tx.h
@@ -29,11 +29,11 @@ static PyMethodDef PyDapChainTxItemTypeObjectMethods[] ={
     {"TX_ITEM_TYPE_IN", (PyCFunction)TX_ITEM_TYPE_IN_PY, METH_NOARGS | METH_STATIC, ""},
     {"TX_ITEM_TYPE_OUT", (PyCFunction)TX_ITEM_TYPE_OUT_PY, METH_NOARGS | METH_STATIC, ""},
     {"TX_ITEM_TYPE_PKEY", (PyCFunction)TX_ITEM_TYPE_PKEY_PY, METH_NOARGS | METH_STATIC, ""},
-    {"TX_ITEM_TYPE_SIG_PY", (PyCFunction)TX_ITEM_TYPE_SIG_PY, METH_NOARGS | METH_STATIC, ""},
+    {"TX_ITEM_TYPE_SIG", (PyCFunction)TX_ITEM_TYPE_SIG_PY, METH_NOARGS | METH_STATIC, ""},
     {"TX_ITEM_TYPE_TOKEN", (PyCFunction)TX_ITEM_TYPE_TOKEN_PY, METH_NOARGS | METH_STATIC, ""},
     {"TX_ITEM_TYPE_IN_COND", (PyCFunction)TX_ITEM_TYPE_IN_COND_PY, METH_NOARGS | METH_STATIC, ""},
     {"TX_ITEM_TYPE_OUT_COND", (PyCFunction)TX_ITEM_TYPE_OUT_COND_PY, METH_NOARGS | METH_STATIC, ""},
-    {"TX_ITEM_TYPE_OUT_SERVICE_RECEIPT_PY", (PyCFunction)TX_ITEM_TYPE_OUT_SERVICE_RECEIPT_PY,
+    {"TX_ITEM_TYPE_OUT_SERVICE_RECEIPT", (PyCFunction)TX_ITEM_TYPE_OUT_SERVICE_RECEIPT_PY,
                                                             METH_NOARGS | METH_STATIC, ""},
     {NULL, NULL, 0, NULL}
 };