diff --git a/bin/ch-convert b/bin/ch-convert
index 103310e6c..42d12dac0 100755
--- a/bin/ch-convert
+++ b/bin/ch-convert
@@ -116,8 +116,13 @@ cv_dir_squash () {
     # Exclude build cache metadata. 64kiB block size based on Shane’s
     # experiments.
     # shellcheck disable=SC2086
+    q=
+    if mksquashfs --help 2>&1 | grep -qE '^-quiet'; then
+	q=-quiet
+    fi
     quiet mksquashfs "$1" "$2" $squash_xattr_arg -b 65536 -noappend -all-root \
-                         -pf "$pflist" -e "$1"/ch/git -e "$1"/ch/git.pickle
+		-pf "$pflist" -e "$1"/ch/git -e "$1"/ch/git.pickle $q
+
     # Zero the archive’s internal modification time at bytes 8–11, 0-indexed
     # [1]. Newer SquashFS-Tools ≥4.3 have option “-fstime 0” to do this, but
     # CentOS 7 comes with 4.2.  [1]: https://dr-emann.github.io/squashfs/