diff --git a/TM/setupclass.py b/TM/setupclass.py
index 9b5f92cfcd9ab75512f23bff57394cccbcd7be21..8a8be623ae49e04e55d74dc5e212fbaae8df1e08 100644
--- a/TM/setupclass.py
+++ b/TM/setupclass.py
@@ -212,7 +212,7 @@ class Setup:
 
         if not self.chunkCacheDir:
             # (self.directory is already absolute)
-            self.chunkCacheDir = os.path.join(self.directory, 'chunks_%d' % self.chunk_len)
+            self.chunkCacheDir = os.path.join(self.directory, 'chunks' % self.chunk_len)
         else:
             dirname = os.path.basename(self.directory).replace('results', self.region)
             self.chunkCacheDir = os.path.join(self.chunkCacheDir,