diff --git a/acpid/src/acpi.rs b/acpid/src/acpi.rs
index bce1f2f6e0..9bd620ef6d 100644
--- a/acpid/src/acpi.rs
+++ b/acpid/src/acpi.rs
@@ -191,7 +191,7 @@ impl Sdt {
 
         while left > 0 {
             let to_copy = std::cmp::min(left, length_per_iteration);
-            let additional_pages = PhysmapGuard::map(offset, length_per_iteration)?;
+            let additional_pages = PhysmapGuard::map(offset, to_copy.div_ceil(PAGE_SIZE))?;
 
             loaded.extend(&additional_pages[..to_copy]);
 
diff --git a/acpid/src/main.rs b/acpid/src/main.rs
index d94f762938..47a4cd5cbd 100644
--- a/acpid/src/main.rs
+++ b/acpid/src/main.rs
@@ -1,4 +1,4 @@
-#![feature(if_let_guard)]
+#![feature(if_let_guard, int_roundings)]
 
 use std::convert::TryFrom;
 use std::io::{self, prelude::*};