diff --git a/hardware/arduino/sam/cores/arduino/avr/dtostrf.c b/hardware/arduino/sam/cores/arduino/avr/dtostrf.c
index 1b5884580..51541739c 100644
--- a/hardware/arduino/sam/cores/arduino/avr/dtostrf.c
+++ b/hardware/arduino/sam/cores/arduino/avr/dtostrf.c
@@ -20,11 +20,8 @@
 
 char *dtostrf (double val, signed char width, unsigned char prec, char *sout) {
   char fmt[20];
-  if (width<0) {
-    sprintf(fmt, "%%-%d.%df", width, prec);
-  } else {
-    sprintf(fmt, "%%%d.%df", width, prec);
-  }
+  sprintf(fmt, "%%%d.%df", width, prec);
   sprintf(sout, fmt, val);
   return sout;
 }
+