diff --git a/src/port/snprintf.c b/src/port/snprintf.c
index b9b6add..f75369c 100644
--- a/src/port/snprintf.c
+++ b/src/port/snprintf.c
@@ -1137,17 +1137,19 @@ fmtfloat(double value, char type, int forcesign, int leftjust,
 		zeropadlen = precision - prec;
 		fmt[0] = '%';
 		fmt[1] = '.';
-		fmt[2] = '*';
-		fmt[3] = type;
-		fmt[4] = '\0';
-		vallen = sprintf(convert, fmt, prec, value);
+		fmt[2] = (prec / 100) + '0';
+		fmt[3] = ((prec % 100) / 10) + '0';
+		fmt[4] = (prec % 10) + '0';
+		fmt[5] = type;
+		fmt[6] = '\0';
+		vallen = strfromd(convert, sizeof(convert), fmt, value);
 	}
 	else
 	{
 		fmt[0] = '%';
 		fmt[1] = type;
 		fmt[2] = '\0';
-		vallen = sprintf(convert, fmt, value);
+		vallen = strfromd(convert, sizeof(convert), fmt, value);
 	}
 	if (vallen < 0)
 		goto fail;