diff --git a/src/s1reader/s1_burst_slc.py b/src/s1reader/s1_burst_slc.py
index 2c68330..022df0a 100644
--- a/src/s1reader/s1_burst_slc.py
+++ b/src/s1reader/s1_burst_slc.py
@@ -668,7 +668,7 @@ def width(self):
     @property
     def swath_name(self):
         '''Swath name in iw1, iw2, iw3.'''
-        return self.burst_id.swath_name
+        return self.burst_id.subswath.lower()
 
     @property
     def thermal_noise_lut(self):