Floating point fail

void setup() {
  // put your setup code here, to run once:
  Serial.begin(9600);
  char buffer[20];
  float myFloat = 3.145;
  Serial.println("Serial print...");
  Serial.println(myFloat);
  Serial.println("now with sprintf");
  sprintf(buffer, "Value: %f", myFloat);
  //sprintf(buffer, "Value:");
  Serial.println(buffer);
}

void loop() {
  // put your main code here, to run repeatedly: