diff --git a/cmd/utils/flags.go b/cmd/utils/flags.go
index 4780a81373..2f3c9f0caf 100644
--- a/cmd/utils/flags.go
+++ b/cmd/utils/flags.go
@@ -752,7 +752,7 @@ func MakeDataDir(ctx *cli.Context) string {
 		}
 		return path
 	}
-	Fatalf("Cannot determine default data directory, please set manually (--datadir)")
+	Fatalf("Cannot determine default data directory, please set manually (--%s)", DataDirFlag.Name)
 	return ""
 }