diff --git a/command/autocomplete.go b/command/autocomplete.go
index 15099fa52..b18e80465 100644
--- a/command/autocomplete.go
+++ b/command/autocomplete.go
@@ -15,3 +15,19 @@ var completePredictBoolean = complete.PredictSet("true", "false")
 // We don't currently have a real predictor for module sources, but
 // we'll probably add one later.
 var completePredictModuleSource = complete.PredictAnything
+
+type completePredictSequence []complete.Predictor
+
+func (s completePredictSequence) Predict(a complete.Args) []string {
+	// Only one level of command is stripped off the prefix of a.Completed
+	// here, so nested subcommands like "workspace new" will need to provide
+	// dummy entries (e.g. complete.PredictNothing) as placeholders for
+	// all but the first subcommand. For example, "workspace new" needs
+	// one placeholder for the argument "new".
+	idx := len(a.Completed)
+	if idx >= len(s) {
+		return nil
+	}
+
+	return s[idx].Predict(a)
+}