diff --git a/vmm/src/device_manager.rs b/vmm/src/device_manager.rs
index 42c675e33..ba5a6d456 100644
--- a/vmm/src/device_manager.rs
+++ b/vmm/src/device_manager.rs
@@ -348,15 +348,9 @@ pub enum DeviceManagerError {
     /// Could not find the node in the device tree.
     MissingNode,
 
-    /// Could not find a MMIO range.
-    MmioRangeAllocation,
-
     /// Resource was already found.
     ResourceAlreadyExists,
 
-    /// Expected resources for virtio-mmio could not be found.
-    MissingVirtioMmioResources,
-
     /// Expected resources for virtio-pci could not be found.
     MissingVirtioPciResources,