diff --git a/.env b/.env
index adfae67..a93b484 100644
--- a/.env
+++ b/.env
@@ -5,7 +5,7 @@
 #   We provide examples in the comments to give you an idea of the expected format.
 
 # Foundry install dir for checkpoints
-FOUNDRY_CHECKPOINTS_DIR='checkpoints'
+FOUNDRY_CHECKPOINTS_DIR='.foundry'
 
 # --- Mirrors to RCSB data ---