diff --git a/vmm/src/device_manager.rs b/vmm/src/device_manager.rs
index ce4f962c6..3b677fa2f 100644
--- a/vmm/src/device_manager.rs
+++ b/vmm/src/device_manager.rs
@@ -3968,7 +3968,7 @@ impl DeviceManager {
             // Register DMA mapping in IOMMU.
             // Do not register virtio-mem regions, as they are handled directly by
             // virtio-mem device itself.
-            for (_, zone) in self.memory_manager.lock().unwrap().memory_zones().iter() {
+            for zone in self.memory_manager.lock().unwrap().memory_zones().values() {
                 for region in zone.regions() {
                     // vfio_dma_map is unsound and ought to be marked as unsafe
                     #[allow(unused_unsafe)]
@@ -4237,7 +4237,7 @@ impl DeviceManager {
                 .map_err(DeviceManagerError::AddDmaMappingHandlerVirtioMem)?;
         }
 
-        for (_, zone) in self.memory_manager.lock().unwrap().memory_zones().iter() {
+        for zone in self.memory_manager.lock().unwrap().memory_zones().values() {
             for region in zone.regions() {
                 vfio_user_pci_device
                     .dma_map(region)
@@ -4378,7 +4378,7 @@ impl DeviceManager {
 
                 // Do not register virtio-mem regions, as they are handled directly by
                 // virtio-mem devices.
-                for (_, zone) in self.memory_manager.lock().unwrap().memory_zones().iter() {
+                for zone in self.memory_manager.lock().unwrap().memory_zones().values() {
                     for region in zone.regions() {
                         let gpa = region.start_addr().0;
                         let size = region.len();
@@ -4959,7 +4959,7 @@ impl DeviceManager {
                 if let Some(dma_handler) = dev.dma_handler()
                     && !iommu_attached
                 {
-                    for (_, zone) in self.memory_manager.lock().unwrap().memory_zones().iter() {
+                    for zone in self.memory_manager.lock().unwrap().memory_zones().values() {
                         for region in zone.regions() {
                             let iova = region.start_addr().0;
                             let size = region.len();
@@ -4979,7 +4979,7 @@ impl DeviceManager {
             }
             PciDeviceHandle::VfioUser(vfio_user_pci_device) => {
                 let mut dev = vfio_user_pci_device.lock().unwrap();
-                for (_, zone) in self.memory_manager.lock().unwrap().memory_zones().iter() {
+                for zone in self.memory_manager.lock().unwrap().memory_zones().values() {
                     for region in zone.regions() {
                         // On error, log, but continue so the loop below removing the mapping from
                         // the devices runs.
diff --git a/vmm/src/device_tree.rs b/vmm/src/device_tree.rs
index e84cb524d..c1cb000df 100644
--- a/vmm/src/device_tree.rs
+++ b/vmm/src/device_tree.rs
@@ -114,7 +114,7 @@ impl<'a> BftIter<'a> {
         let mut nodes = Vec::with_capacity(hash_map.len());
         let mut i = 0;
 
-        for (_, node) in hash_map.iter() {
+        for node in hash_map.values() {
             if node.parent.is_none() {
                 nodes.push(node);
             }
diff --git a/vmm/src/interrupt.rs b/vmm/src/interrupt.rs
index 7fe5aa966..bf9957823 100644
--- a/vmm/src/interrupt.rs
+++ b/vmm/src/interrupt.rs
@@ -191,7 +191,7 @@ impl MsiInterruptGroup {
 
     fn set_gsi_routes(&self, routes: &HashMap<u32, RoutingEntry>) -> Result<()> {
         let mut entry_vec: Vec<IrqRoutingEntry> = Vec::new();
-        for (_, entry) in routes.iter() {
+        for entry in routes.values() {
             if entry.masked {
                 continue;
             }
@@ -207,7 +207,7 @@ impl MsiInterruptGroup {
 
 impl InterruptSourceGroup for MsiInterruptGroup {
     fn enable(&self) -> Result<()> {
-        for (_, route) in self.irq_routes.iter() {
+        for route in self.irq_routes.values() {
             route.lock().unwrap().enable(self.vm.as_ref())?;
         }
 
@@ -215,7 +215,7 @@ impl InterruptSourceGroup for MsiInterruptGroup {
     }
 
     fn disable(&self) -> Result<()> {
-        for (_, route) in self.irq_routes.iter() {
+        for route in self.irq_routes.values() {
             route.lock().unwrap().disable(self.vm.as_ref())?;
         }