diff --git a/tests/boot-order-test.c b/tests/boot-order-test.c
index c711c712f4..75b164219d 100644
--- a/tests/boot-order-test.c
+++ b/tests/boot-order-test.c
@@ -112,6 +112,30 @@ static void test_pc_boot_order(void)
     test_boot_orders(NULL, read_boot_order_pc, test_cases_pc);
 }
 
+static uint8_t read_m48t59(uint64_t addr, uint16_t reg)
+{
+    writeb(addr, reg & 0xff);
+    writeb(addr + 1, reg >> 8);
+    return readb(addr + 3);
+}
+
+static uint64_t read_boot_order_prep(void)
+{
+    return read_m48t59(0x80000000 + 0x74, 0x34);
+}
+
+static const boot_order_test test_cases_prep[] = {
+    { "", 'c', 'c' },
+    { "-boot c", 'c', 'c' },
+    { "-boot d", 'd', 'd' },
+    {}
+};
+
+static void test_prep_boot_order(void)
+{
+    test_boot_orders("prep", read_boot_order_prep, test_cases_prep);
+}
+
 static uint64_t read_boot_order_pmac(void)
 {
     QFWCFG *fw_cfg = mm_fw_cfg_init(0xf0000510);
@@ -146,6 +170,7 @@ int main(int argc, char *argv[])
     if (strcmp(arch, "i386") == 0 || strcmp(arch, "x86_64") == 0) {
         qtest_add_func("boot-order/pc", test_pc_boot_order);
     } else if (strcmp(arch, "ppc") == 0 || strcmp(arch, "ppc64") == 0) {
+        qtest_add_func("boot-order/prep", test_prep_boot_order);
         qtest_add_func("boot-order/pmac_oldworld",
                        test_pmac_oldworld_boot_order);
         qtest_add_func("boot-order/pmac_newworld",