diff --git a/cosmo-all/Dockerfile b/cosmo-all/Dockerfile
index 45b5b4b..665f034 100644
--- a/cosmo-all/Dockerfile
+++ b/cosmo-all/Dockerfile
@@ -34,7 +34,7 @@ RUN --mount=type=tmpfs,target=/tmp : \
  && skip "o/$mode/test/libc/calls/getgroups_test.com.runs" \
  && skip "o/$mode/test/libc/calls/getpriority_test.com.runs" \
 # these can fail when nesting podman: \
- && skip "o/$mode/test/libc/calls/ftruncate_test.com.runs" \
+ && shed test/libc/calls/ftruncate_test.c '/\.st_blocks/d' \
  && skip "o/$mode/test/libc/stdio/tmpfile_test.com.runs" \
  && skip "o/$mode/test/tool/net/lunix_test.lua.runs" \
  && skip "o/$mode/third_party/python/Lib/test/test_selectors.py.runs" \