diff --git a/CHANGELOG.md b/CHANGELOG.md
index bee4170e0aa..a7ee3458784 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 ## 1.0.3 (Unreleased)
 
+BUG FIXES:
+
+ * scheduler: Fixed a bug where shared ports were not persisted during inplace updates for service jobs. [[GH-9830](https://github.com/hashicorp/nomad/issues/9830)]
+
 ## 1.0.2 (January 14, 2020)
 
 IMPROVEMENTS:
diff --git a/scheduler/generic_sched_test.go b/scheduler/generic_sched_test.go
index dc34c78a90b..842a85b29c6 100644
--- a/scheduler/generic_sched_test.go
+++ b/scheduler/generic_sched_test.go
@@ -2080,6 +2080,11 @@ func TestServiceSched_JobModify_InPlace(t *testing.T) {
 		DeviceIDs: []string{uuid.Generate()},
 	}
 
+	asr := structs.AllocatedSharedResources{
+		Ports:    structs.AllocatedPorts{{Label: "http"}},
+		Networks: structs.Networks{{Mode: "bridge"}},
+	}
+
 	// Create allocs that are part of the old deployment
 	var allocs []*structs.Allocation
 	for i := 0; i < 10; i++ {
@@ -2091,6 +2096,7 @@ func TestServiceSched_JobModify_InPlace(t *testing.T) {
 		alloc.DeploymentID = d.ID
 		alloc.DeploymentStatus = &structs.AllocDeploymentStatus{Healthy: helper.BoolToPtr(true)}
 		alloc.AllocatedResources.Tasks[taskName].Devices = []*structs.AllocatedDeviceResource{&adr}
+		alloc.AllocatedResources.Shared = asr
 		allocs = append(allocs, alloc)
 	}
 	require.NoError(t, h.State.UpsertAllocs(structs.MsgTypeTestSetup, h.NextIndex(), allocs))
@@ -2167,6 +2173,10 @@ func TestServiceSched_JobModify_InPlace(t *testing.T) {
 	// Verify the allocated networks and devices did not change
 	rp := structs.Port{Label: "admin", Value: 5000}
 	for _, alloc := range out {
+		// Verify Shared Allocared Resources Persisted
+		require.Equal(t, alloc.AllocatedResources.Shared.Ports, asr.Ports)
+		require.Equal(t, alloc.AllocatedResources.Shared.Networks, asr.Networks)
+
 		for _, resources := range alloc.AllocatedResources.Tasks {
 			if resources.Networks[0].ReservedPorts[0] != rp {
 				t.Fatalf("bad: %#v", alloc)
diff --git a/scheduler/util.go b/scheduler/util.go
index b42895a16b8..191cf5d0f7f 100644
--- a/scheduler/util.go
+++ b/scheduler/util.go
@@ -1014,7 +1014,7 @@ func genericAllocUpdateFn(ctx Context, stack Stack, evalID string) allocUpdateTy
 			},
 		}
 
-		// Since this is an inplace update, we should copy network
+		// Since this is an inplace update, we should copy network and port
 		// information from the original alloc. This is similar to how
 		// we copy network info for task level networks above.
 		//
@@ -1022,6 +1022,7 @@ func genericAllocUpdateFn(ctx Context, stack Stack, evalID string) allocUpdateTy
 		// Nomad v0.8 or earlier.
 		if existing.AllocatedResources != nil {
 			newAlloc.AllocatedResources.Shared.Networks = existing.AllocatedResources.Shared.Networks
+			newAlloc.AllocatedResources.Shared.Ports = existing.AllocatedResources.Shared.Ports
 		}
 
 		// Use metrics from existing alloc for in place upgrade