diff --git a/.buildkite/hooks/pre-command b/.buildkite/hooks/pre-command
index 5e9349ac39..671f0a8661 100644
--- a/.buildkite/hooks/pre-command
+++ b/.buildkite/hooks/pre-command
@@ -17,8 +17,8 @@ export PS4="++"
 
   if [[ -d $d ]]; then
     du -hs "$d"
-    read -r cacheSizeInGB _ < <(du -s --block-size=1000000000 "$d")
-    if [[ $cacheSizeInGB -gt 10 ]]; then
+    read -r cacheSizeInGB _ < <(du -s --block-size=1800000000 "$d")
+    if [[ $cacheSizeInGB -gt 18 ]]; then
       echo "$d has gotten too large, removing it"
       rm -rf "$d"
     fi