diff --git a/master/master.cfg b/master/master.cfg
index e4bf0d38..5acf952f 100644
--- a/master/master.cfg
+++ b/master/master.cfg
@@ -139,6 +139,11 @@ GIT_KWDS = {
     # ignoring the .gitignore rules (ex: remove also ".o" files).
     "mode": "full",
     "method": "fresh",
+    # Partial (blobless) clone: only fetch commit and tree objects,
+    # blobs are fetched on demand during checkout.
+    "filters": ["blob:none"],
+    # If fetch fails, wipe and re-clone instead of failing the build.
+    "clobberOnFailure": True,
 }
 
 c["builders"] = []