diff --git a/src/engines/jetson_tensorrt_engine.pyx b/src/engines/jetson_tensorrt_engine.pyx
index cc9fc56..0826f32 100644
--- a/src/engines/jetson_tensorrt_engine.pyx
+++ b/src/engines/jetson_tensorrt_engine.pyx
@@ -1,5 +1,6 @@
 import os
 import tempfile
+cimport constants_inf
 from engines.tensorrt_engine cimport TensorRTEngine
 from loader_http_client cimport LoaderHttpClient, LoadResult
 
@@ -21,7 +22,6 @@ cdef class JetsonTensorRTEngine(TensorRTEngine):
     @staticmethod
     def _download_calib_cache(LoaderHttpClient loader_client, str models_dir):
         cdef LoadResult res
-        import constants_inf
         try:
             res = loader_client.load_big_small_resource(
                 constants_inf.INT8_CALIB_CACHE_FILE, models_dir