diff --git a/src/api/vm.coffee b/src/api/vm.coffee
index 06ef0bafe..5d73c6a17 100644
--- a/src/api/vm.coffee
+++ b/src/api/vm.coffee
@@ -325,6 +325,9 @@ set = $coroutine (params) ->
     else
       yield xapi.call 'VM.remove_from_other_config', ref, 'auto_poweron'
 
+  if 'cpuWeight' of params
+    yield xapi.setVcpuWeight(vm._xapiId, params.cpuWeight)
+
   # Other fields.
   for param, fields of {
     'name_label'
@@ -362,6 +365,8 @@ set.params = {
 
   # Kernel arguments for PV VM.
   PV_args: { type: 'string', optional: true }
+
+  cpuWeight: { type: 'integer', optional: true}
 }
 
 set.resolve = {
diff --git a/src/xapi-object-to-xo.js b/src/xapi-object-to-xo.js
index ae175818a..55f3ba6a7 100644
--- a/src/xapi-object-to-xo.js
+++ b/src/xapi-object-to-xo.js
@@ -308,6 +308,10 @@ const TRANSFORMS = {
       }
     }
 
+    if (obj.VCPUs_params && obj.VCPUs_params.weight) {
+      vm.cpuWeight = obj.VCPUs_params.weight
+    }
+
     if (!isHvm) {
       vm.PV_args = obj.PV_args
     }
diff --git a/src/xapi.js b/src/xapi.js
index cab14e4f8..bd36abc24 100644
--- a/src/xapi.js
+++ b/src/xapi.js
@@ -1657,6 +1657,11 @@ export default class Xapi extends XapiBase {
     )
   }
 
+  async setVcpuWeight (vmId, weight) {
+    const vm = this.getObject(vmId)
+    await this._updateObjectMapProperty(vm, 'VCPUs_params', {weight})
+  }
+
   _startVm (vm) {
     debug(`Starting VM ${vm.name_label}`)