diff --git a/DHT.h b/DHT.h
index 11e9101..d6c2412 100644
--- a/DHT.h
+++ b/DHT.h
@@ -29,7 +29,7 @@ class DHT {
  public:
   DHT(uint8_t pin, uint8_t type);
   void begin(void);
-  float readTemperature(bool);
+  float readTemperature(bool S=false);
   float convertCtoF(float);
   float readHumidity(void);