diff --git a/docker/base/setup_clusterfuzz.sh b/docker/base/setup_clusterfuzz.sh
index 4b51d33f00f..8e18e48ea94 100644
--- a/docker/base/setup_clusterfuzz.sh
+++ b/docker/base/setup_clusterfuzz.sh
@@ -52,7 +52,7 @@ fi
 # set up mounts in this case.
 if [[ -z "$DISABLE_MOUNTS" ]]; then
   # Setup Tmpfs dirs for frequently accessed files to save disk I/O.
-  mount -t tmpfs -o size=250M,mode=777 tmpfs $INSTALL_DIRECTORY/clusterfuzz/bot/inputs/fuzzer-testcases/
+  mount -t tmpfs -o size=1280M,mode=777 tmpfs $INSTALL_DIRECTORY/clusterfuzz/bot/inputs/fuzzer-testcases/
   mount -t tmpfs -o size=10M,mode=777 tmpfs $INSTALL_DIRECTORY/clusterfuzz/bot/logs/
   mount -t tmpfs -o size=90M,mode=777 tmpfs $BOT_TMPDIR
 
diff --git a/src/clusterfuzz/_internal/fuzzing/corpus_manager.py b/src/clusterfuzz/_internal/fuzzing/corpus_manager.py
index c335b8f319c..c489bedfc93 100644
--- a/src/clusterfuzz/_internal/fuzzing/corpus_manager.py
+++ b/src/clusterfuzz/_internal/fuzzing/corpus_manager.py
@@ -479,7 +479,7 @@ def _sync_corpus_to_disk(self, corpus, directory):
     """Syncs a corpus from GCS to disk."""
     shell.create_directory(directory, create_intermediates=True)
     if corpus.backup_url:
-      tmpdir = environment.get_value('BOT_TMPDIR')
+      tmpdir = environment.get_value('FUZZ_INPUTS')
       with tempfile.NamedTemporaryFile(
           dir=tmpdir, suffix='.zip') as temp_zipfile:
         try: