diff --git a/process_maps.py b/process_maps.py
index fdba336..7c639b5 100755
--- a/process_maps.py
+++ b/process_maps.py
@@ -116,6 +116,7 @@ if __name__ == '__main__':
 		osmosis_cmd.extend(['type=ram'])
 	else:
 		osmosis_cmd.extend(['type=hd'])
+	osmosis_cmd.extend(['threads=4'])
 	cmd = subprocess.Popen(osmosis_cmd, env=env)
 	cmd.wait()