diff --git a/etl/check_ab_mm_match.py b/etl/check_ab_mm_match.py
index 76c59686..a43dc509 100644
--- a/etl/check_ab_mm_match.py
+++ b/etl/check_ab_mm_match.py
@@ -22,7 +22,7 @@ def main(ab_path, mm_path):
     zipped_paths = zip(ab_paths, mm_paths)
 
     # parallel map over tiles
-    with Pool(4) as p:
+    with Pool() as p:
         p.starmap(check, zipped_paths)
 
 def check(ab_path, mm_path):
diff --git a/etl/create_building_records.sh b/etl/create_building_records.sh
old mode 100644
new mode 100755
diff --git a/etl/filter_mastermap.py b/etl/filter_mastermap.py
index a32bde15..e35b3ea4 100644
--- a/etl/filter_mastermap.py
+++ b/etl/filter_mastermap.py
@@ -25,7 +25,7 @@ def main(ab_path, mm_path):
     zipped_paths = zip(mm_paths, toid_paths)
 
     # parallel map over tiles
-    with Pool(4) as p:
+    with Pool() as p:
         p.starmap(filter, zipped_paths)
 
 def filter(mm_path, toid_path):