diff --git a/build-all b/build-all
index 79a2147..cac2775 100755
--- a/build-all
+++ b/build-all
@@ -72,7 +72,7 @@ build_simple() { : \
  && build   cosmo-yices         \
 \
 `# other stuff` \
- && { [ ! -e cosmo-mini ] || build cosmo-mini ;} \
+ && { [ ! -s cosmo-mini/Dockerfile ] || build cosmo-mini ;} \
 \
  && yes_retrieve cosmo-base     /cosmopolitan/bin/ape \
  && dbg_retrieve cosmo-kuroko   /bin/kuroko.com \