diff --git a/cmd/containerd/main.go b/cmd/containerd/main.go
index 0cb954f..ad8a286 100644
--- a/cmd/containerd/main.go
+++ b/cmd/containerd/main.go
@@ -135,7 +135,7 @@ high performance container runtime
 				ctx = log.WithModule(ctx, "execution")
 				ctx = events.WithPoster(ctx, events.GetNATSPoster(nec))
 			default:
-				fmt.Println("Unknown type: %#v", info.Server)
+				fmt.Printf("Unknown type: %#v\n", info.Server)
 			}
 			return handler(ctx, req)
 		}
diff --git a/execution/service.go b/execution/service.go
index cb3303b..5636c5b 100644
--- a/execution/service.go
+++ b/execution/service.go
@@ -160,8 +160,8 @@ func (s *Service) StartProcess(ctx context.Context, r *api.StartProcessRequest)
 	spec := specs.Process{
 		Terminal: r.Process.Terminal,
 		ConsoleSize: specs.Box{
-			80,
-			80,
+			Height: 80,
+			Width:  80,
 		},
 		Args:            r.Process.Args,
 		Env:             r.Process.Env,
diff --git a/snapshot/btrfs_test.go b/snapshot/btrfs_test.go
index 2511bd0..69311d7 100644
--- a/snapshot/btrfs_test.go
+++ b/snapshot/btrfs_test.go
@@ -32,12 +32,12 @@ func TestBtrfs(t *testing.T) {
 
 	for _, mount := range mounts {
 		if mount.Type != "btrfs" {
-			t.Fatal("wrong mount type: %v != btrfs", mount.Type)
+			t.Fatalf("wrong mount type: %v != btrfs", mount.Type)
 		}
 
 		// assumes the first, maybe incorrect in the future
 		if !strings.HasPrefix(mount.Options[0], "subvolid=") {
-			t.Fatal("no subvolid option in %v", mount.Options)
+			t.Fatalf("no subvolid option in %v", mount.Options)
 		}
 	}