diff --git a/hardware/arduino/avr/cores/arduino/Print.cpp b/hardware/arduino/avr/cores/arduino/Print.cpp
index 5a092af717c..d82990458b5 100644
--- a/hardware/arduino/avr/cores/arduino/Print.cpp
+++ b/hardware/arduino/avr/cores/arduino/Print.cpp
@@ -257,7 +257,7 @@ size_t Print::printFloat(double number, uint8_t digits)
   while (digits-- > 0)
   {
     remainder *= 10.0;
-    int toPrint = int(remainder);
+    unsigned toPrint = unsigned(remainder);
     n += print(toPrint);
     remainder -= toPrint; 
   }