diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index 4ece850b2af1..58e7c47354ee 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -1073,7 +1073,7 @@ acpi_native_uint acpi_os_acquire_lock(acpi_handle handle)
 
 void acpi_os_release_lock(acpi_handle handle, acpi_native_uint flags)
 {
-	spin_unlock_irqrestore((spinlock_t *) handle, flags);
+	spin_unlock_irqrestore((spinlock_t *) handle, (unsigned long) flags);
 }
 
 #ifndef ACPI_USE_LOCAL_CACHE