diff --git a/cores/arduino/WString.cpp b/cores/arduino/WString.cpp
index 5dcf585..41c80e8 100644
--- a/cores/arduino/WString.cpp
+++ b/cores/arduino/WString.cpp
@@ -157,6 +157,7 @@ String & String::copy(const char *cstr, unsigned int length)
 	return *this;
 }
 
+#ifdef __GXX_EXPERIMENTAL_CXX0X__
 void String::move(String &rhs)
 {
 	if (buffer) {
@@ -176,6 +177,7 @@ void String::move(String &rhs)
 	rhs.capacity = 0;
 	rhs.len = 0;
 }
+#endif
 
 String & String::operator = (const String &rhs)
 {
@@ -340,6 +342,11 @@ StringSumHelper & operator + (const StringSumHelper &lhs, unsigned long num)
 /*  Comparison                               */
 /*********************************************/
 
+String::operator bool() const
+{
+	return !!buffer;
+}
+
 int String::compareTo(const String &s) const
 {
 	if (!buffer || !s.buffer) {
diff --git a/cores/arduino/WString.h b/cores/arduino/WString.h
index f797861..5e78ee5 100644
--- a/cores/arduino/WString.h
+++ b/cores/arduino/WString.h
@@ -63,7 +63,9 @@ public:
 
 	// copy and move
 	String & copy(const char *cstr, unsigned int length);
+	#ifdef __GXX_EXPERIMENTAL_CXX0X__
 	void move(String &rhs);
+	#endif
 	String & operator = (const String &rhs);
 	String & operator = (const char *cstr);
 	#ifdef __GXX_EXPERIMENTAL_CXX0X__
@@ -101,6 +103,7 @@ public:
 	friend StringSumHelper & operator + (const StringSumHelper &lhs, unsigned long num);
 
 	// comparison
+	operator bool() const;
 	int compareTo(const String &s) const;
 	unsigned char equals(const String &s) const;
 	unsigned char equals(const char *cstr) const;