diff --git a/drivers/acpid/src/dmi.rs b/drivers/acpid/src/dmi.rs
index 31db820a0e..befe47aba7 100644
--- a/drivers/acpid/src/dmi.rs
+++ b/drivers/acpid/src/dmi.rs
@@ -155,7 +155,7 @@ impl PhysmapGuard {
 
         let virt = unsafe {
             common::physmap(phys_start, map_size, Prot { read: true, write: false }, MemoryType::default())
-                .map_err(DmiError::Map)?
+                .map_err(|e| DmiError::Map(libredox::error::Error::new(e.errno)))?
         };
         Ok(Self {
             virt: virt as *mut u8,