diff --git a/usr.bin/du/tests/du_test.sh b/usr.bin/du/tests/du_test.sh
--- a/usr.bin/du/tests/du_test.sh
+++ b/usr.bin/du/tests/du_test.sh
@@ -24,6 +24,17 @@
 #
 # $FreeBSD$
 
+require_sparse_file_support()
+{
+	if ! getconf MIN_HOLE_SIZE "$(pwd)"; then
+		echo "getconf MIN_HOLE_SIZE $(pwd) failed; sparse files " \
+		    "probably not supported by file system"
+		mount
+		atf_skip "Test's work directory does not support sparse files;" \
+		    "try with a different TMPDIR?"
+	fi
+}
+
 atf_test_case A_flag
 A_flag_head()
 {
@@ -31,6 +42,7 @@
 }
 A_flag_body()
 {
+	require_sparse_file_support
 	# XXX: compressed volumes?
 	atf_check truncate -s 10g sparse.file
 	atf_check -o inline:'1\tsparse.file\n' du -g sparse.file
@@ -103,6 +115,7 @@
 }
 g_flag_body()
 {
+	require_sparse_file_support
 	atf_check truncate -s 1k A
 	atf_check truncate -s 1m B
 	atf_check truncate -s 1g C
@@ -117,6 +130,7 @@
 }
 h_flag_body()
 {
+	require_sparse_file_support
 	atf_check truncate -s 1k A
 	atf_check truncate -s 1m B
 	atf_check truncate -s 1g C