diff --git a/lldb/include/lldb/Interpreter/OptionValue.h b/lldb/include/lldb/Interpreter/OptionValue.h
--- a/lldb/include/lldb/Interpreter/OptionValue.h
+++ b/lldb/include/lldb/Interpreter/OptionValue.h
@@ -114,8 +114,7 @@
   virtual lldb::OptionValueSP GetSubValue(const ExecutionContext *exe_ctx,
                                           llvm::StringRef name,
                                           Status &error) const {
-    error.SetErrorStringWithFormat("'%s' is not a value subvalue",
-                                   name.str().c_str());
+    error.SetErrorStringWithFormatv("'{0}' is not a valid subvalue", name);
     return lldb::OptionValueSP();
   }