diff --git a/cores/arduino/WString.cpp b/cores/arduino/WString.cpp
index 9975303..998cf22 100644
--- a/cores/arduino/WString.cpp
+++ b/cores/arduino/WString.cpp
@@ -740,6 +740,11 @@ long String::toInt(void) const
 
 float String::toFloat(void) const
 {
-	if (buffer) return float(atof(buffer));
-	return 0;
+	return float(toDouble());
 }
+
+double String::toDouble(void) const
+{
+    if (buffer) return atof(buffer);
+    return 0;
+}
\ No newline at end of file
diff --git a/cores/arduino/WString.h b/cores/arduino/WString.h
index de5632c..08b8147 100644
--- a/cores/arduino/WString.h
+++ b/cores/arduino/WString.h
@@ -190,6 +190,7 @@ public:
 	// parsing/conversion
 	long toInt(void) const;
 	float toFloat(void) const;
+    double toDouble(void) const;
 
 protected:
 	char *buffer;	        // the actual char array