diff --git a/app/os_android.go b/app/os_android.go
index d1068193..17d29162 100644
--- a/app/os_android.go
+++ b/app/os_android.go
@@ -750,7 +750,6 @@ func (w *window) initAccessibilityNodeInfo(env *C.JNIEnv, sem router.SemanticNod
 }
 
 func (w *window) virtualIDFor(id router.SemanticID) C.jint {
-	// TODO: Android virtual IDs are 32-bit Java integers, but childID is a int64.
 	if id == w.semantic.rootID {
 		return HOST_VIEW_ID
 	}
diff --git a/io/router/router.go b/io/router/router.go
index 4bc2a9a4..224e442d 100644
--- a/io/router/router.go
+++ b/io/router/router.go
@@ -88,7 +88,7 @@ const (
 // SemanticID uniquely identifies a SemanticDescription.
 //
 // By convention, the zero value denotes the non-existent ID.
-type SemanticID uint64
+type SemanticID uint
 
 type handlerEvents struct {
 	handlers  map[event.Tag][]event.Event