diff --git a/vmm/src/vm.rs b/vmm/src/vm.rs
index 21a63efe9..21ecd6c88 100755
--- a/vmm/src/vm.rs
+++ b/vmm/src/vm.rs
@@ -1400,7 +1400,7 @@ impl<'a> Vm<'a> {
             &config,
             msi_capable,
             userspace_ioapic,
-            arch_mem_regions.len() as u32,
+            ram_regions.len() as u32,
         )
         .map_err(Error::DeviceManager)?;