diff --git a/src/cam/options.cpp b/src/cam/options.cpp
index 2c56eacf0..77b3cc1f8 100644
--- a/src/cam/options.cpp
+++ b/src/cam/options.cpp
@@ -64,6 +64,12 @@ const OptionValue &OptionsBase<T>::operator[](const T &opt) const
 	return values_.find(opt)->second;
 }
 
+template<typename T>
+void OptionsBase<T>::invalidate()
+{
+	valid_ = false;
+}
+
 template<typename T>
 bool OptionsBase<T>::parseValue(const T &opt, const Option &option,
 				const char *optarg)
diff --git a/src/cam/options.h b/src/cam/options.h
index ad5c93a4f..184866195 100644
--- a/src/cam/options.h
+++ b/src/cam/options.h
@@ -54,6 +54,8 @@ public:
 	bool isSet(const T &opt) const;
 	const OptionValue &operator[](const T &opt) const;
 
+	void invalidate();
+
 private:
 	friend class KeyValueParser;
 	friend class OptionsParser;