diff --git a/nomad/structs/structs.go b/nomad/structs/structs.go
index f26846935..88836112b 100644
--- a/nomad/structs/structs.go
+++ b/nomad/structs/structs.go
@@ -23,6 +23,7 @@ const (
 	JobDeregisterRequestType
 	EvalUpdateRequestType
 	EvalDeleteRequestType
+	AllocUpdateRequestType
 )
 
 const (
@@ -192,6 +193,17 @@ type PlanRequest struct {
 	WriteRequest
 }
 
+// AllocUpdateRequest is used to submit changes to allocations, either
+// to cause evictions or to assign new allocaitons. Both can be done
+// within a single transaction
+type AllocUpdateRequest struct {
+	// Evict is the list of allocation IDs to evict
+	Evict []string
+
+	// Alloc is the list of new allocations to assign
+	Alloc []*Allocation
+}
+
 // GenericResponse is used to respond to a request where no
 // specific response information is needed.
 type GenericResponse struct {