diff --git a/api/s33_dma_cal.py b/api/s33_dma_cal.py
index c06f76b..5f30967 100644
--- a/api/s33_dma_cal.py
+++ b/api/s33_dma_cal.py
@@ -2,7 +2,7 @@ import ctypes
 import os
 from .database import *
 from .s0_base import get_nodes
-from .s32_region_util import get_nodes_in_region, to_postgis_polygon
+from .s32_region_util import get_nodes_in_region
 from .s32_region_util import Topology
 from .s32_region import get_region