diff --git a/generate/main.go b/generate/main.go
index 750e578c..27d2d15f 100644
--- a/generate/main.go
+++ b/generate/main.go
@@ -481,7 +481,7 @@ func main() {
 	l.Write("// or \"\" if the key is unknown.")
 	l.Write("func NameForKey(key int16) string {")
 	l.Write("switch key {")
-	l.Write("default: return \"\"")
+	l.Write("default: return \"Unknown\"")
 	for _, key2struct := range name2structs {
 		l.Write("case %d: return \"%s\"", key2struct.Key, strings.TrimSuffix(key2struct.Name, "Request"))
 	}
diff --git a/pkg/kmsg/generated.go b/pkg/kmsg/generated.go
index a1dc6e0d..75499a5a 100644
--- a/pkg/kmsg/generated.go
+++ b/pkg/kmsg/generated.go
@@ -36220,7 +36220,7 @@ func ResponseForKey(key int16) Response {
 func NameForKey(key int16) string {
 	switch key {
 	default:
-		return ""
+		return "Unknown"
 	case 0:
 		return "Produce"
 	case 1: