diff --git a/workflow/scripts/blaze_to_metadata.py b/workflow/scripts/blaze_to_metadata.py
index 6eb88cd..25a27e3 100644
--- a/workflow/scripts/blaze_to_metadata.py
+++ b/workflow/scripts/blaze_to_metadata.py
@@ -117,7 +117,7 @@
         chunk = map_tiles_to_chunk[d['tilex']+d['tiley']] # want the key to have chunk instad of tilex,tiley, so map to that first
        
         if is_zstack:
-            key = f"tile-{chunk}_chan-{d['channel']}_z-0" 
+            key = f"tile-{chunk}_chan-{d['channel']}_z-0000" 
         else:
             #key is:  tile-{chunk}_chan-{channel}_z-{zslice} 
             key = f"tile-{chunk}_chan-{d['channel']}_z-{d['zslice']}" 
diff --git a/workflow/scripts/blaze_to_metadata_gcs.py b/workflow/scripts/blaze_to_metadata_gcs.py
index cff5302..fac9747 100644
--- a/workflow/scripts/blaze_to_metadata_gcs.py
+++ b/workflow/scripts/blaze_to_metadata_gcs.py
@@ -97,7 +97,7 @@
     chunk = map_tiles_to_chunk[d['tilex']+d['tiley']] # want the key to have chunk instad of tilex,tiley, so map to that first
     
     if is_zstack:
-        key = f"tile-{chunk}_chan-{d['channel']}_z-0" 
+        key = f"tile-{chunk}_chan-{d['channel']}_z-0000" 
     else:
         #key is:  tile-{chunk}_chan-{channel}_z-{zslice} 
         key = f"tile-{chunk}_chan-{d['channel']}_z-{d['zslice']}"