diff --git a/src/spatialdata_io/readers/seqfish.py b/src/spatialdata_io/readers/seqfish.py
index bc0f25de..6dd20688 100644
--- a/src/spatialdata_io/readers/seqfish.py
+++ b/src/spatialdata_io/readers/seqfish.py
@@ -121,7 +121,7 @@ def seqfish(
         adata,
         region=SeqfishKeys.REGION.value,
         region_key=SeqfishKeys.REGION_KEY.value,
-        instance_key=SeqfishKeys.INSTANCE_KEY_TABLE.value,
+        instance_key=SeqfishKeys.INSTANCE_KEY_TABLE,
     )
 
     radii = np.sqrt(adata.obs[SeqfishKeys.AREA].to_numpy() / np.pi)