diff --git a/Moulinette/data_path_config.py b/Moulinette/data_path_config.py
index 7da95e6..082a9eb 100644
--- a/Moulinette/data_path_config.py
+++ b/Moulinette/data_path_config.py
@@ -104,10 +104,11 @@ def excel_parser(sheet_det, slave_no, slave_device, allowed_name_characters, dsh
         else:
             logging.debug("Poll interval undefined, using 1000ms as default.")
             step2_data["pollInterval"] = 1000
-        if row['endian_swap']:
+        if not math.isnan(row['endian_swap']):
+            logging.debug(f"Endian Swap: {row['endian_swap']} {row['metric_name']}")
             step2_data["swap"] = int(row['endian_swap'])
         else:
-            logging.debug("Endian Swap undefined, not using swap as default.")
+            logging.debug(f"Endian Swap undefined, not using swap as default. {row['metric_name']}")
             step2_data["swap"] = 0
         step2_data["dataType"] = row['type']
         if not math.isnan(row['scaling_factor']):