diff --git a/usr.sbin/makefs/tests/makefs_cd9660_tests.sh b/usr.sbin/makefs/tests/makefs_cd9660_tests.sh
index 6621990dd68..8b4e33777f3 100755
--- a/usr.sbin/makefs/tests/makefs_cd9660_tests.sh
+++ b/usr.sbin/makefs/tests/makefs_cd9660_tests.sh
@@ -277,6 +277,10 @@ o_flag_isolevel_3_cleanup()
 }
 
 atf_test_case o_flag_preparer
+o_flag_preparer_head()
+{
+	atf_set "require.progs" "strings"
+}
 o_flag_preparer_body()
 {
 	create_test_dirs
@@ -292,6 +296,10 @@ o_flag_preparer_body()
 }
 
 atf_test_case o_flag_publisher
+o_flag_publisher_head()
+{
+	atf_set "require.progs" "strings"
+}
 o_flag_publisher_body()
 {
 	create_test_dirs