diff --git a/uefi/src/main.rs b/uefi/src/main.rs
index 7b0aa5af..93dfb6c7 100644
--- a/uefi/src/main.rs
+++ b/uefi/src/main.rs
@@ -137,7 +137,9 @@ fn main_inner(image: Handle, mut st: SystemTable<Boot>) -> Status {
     );
 
     log::trace!("exiting boot services");
-    let (system_table, memory_map) = st.exit_boot_services();
+    let (system_table, mut memory_map) = st.exit_boot_services();
+
+    memory_map.sort();
 
     let mut frame_allocator =
         LegacyFrameAllocator::new(memory_map.entries().copied().map(UefiMemoryDescriptor));