diff --git a/drivers/acpi/acpica/exsystem.c b/drivers/acpi/acpica/exsystem.c
index 6095ac83f6f6..0d261d470ffe 100644
--- a/drivers/acpi/acpica/exsystem.c
+++ b/drivers/acpi/acpica/exsystem.c
@@ -175,8 +175,9 @@ acpi_status acpi_ex_system_do_sleep(u64 how_long_ms)
 	 */
 	if (how_long_ms > 10) {
 		ACPI_WARNING((AE_INFO,
-			      "Firmware issue: Excessive sleep time (%lu ms > 10 ms) in ACPI Control Method",
-			      how_long_ms));
+			      "Firmware issue: Excessive sleep time (0x%8.8X%8.8X ms > 10 ms)"
+			      " in ACPI Control Method",
+			      ACPI_FORMAT_UINT64(how_long_ms)));
 	}
 
 	/*