diff --git a/safe_s1/sentinel1_xml_mappings.py b/safe_s1/sentinel1_xml_mappings.py
index 5aa0dc0..37721a5 100644
--- a/safe_s1/sentinel1_xml_mappings.py
+++ b/safe_s1/sentinel1_xml_mappings.py
@@ -240,7 +240,7 @@ def list_poly_from_list_string_coords(str_coords_list):
             '/xfdu:XFDU/metadataSection/metadataObject[@ID="s1Level1MapOverlaySchema"]/metadataReference/@href',
         ),
         "instrument_configuration_id": (
-            scalar,
+            scalar_int,
             "//s1sarl1:standAloneProductInformation/s1sarl1:instrumentConfigurationID/text()",
         ),
     },