diff --git a/libguestfs.spec b/libguestfs.spec
index 891bb92..eff0867 100644
--- a/libguestfs.spec
+++ b/libguestfs.spec
@@ -388,6 +388,8 @@ test -n "$ext_cmds"
 # it must support. Collect a manual list of possible filesystems so that
 # the commands get included in the initrd.
 ext_cmds="$ext_cmds
+sparsify
+strace
 ` for fs in \
 	ext2 \
 	ext3 \