Kill compiler warning.

diff --git a/ext/standard/math.c b/ext/standard/math.c
index daaf20ef0984ca719d12dc2e745b2ade37b3b032..2febcaeffd2b1ecfc49ed6a17ca68b08985a0a56 100644 (file)
--- a/ext/standard/math.c
+++ b/ext/standard/math.c
@@ -604,7 +604,7 @@ char *_php3_number_format(double d,int dec,char dec_point,char thousand_sep)
        
        tmplen=php_sprintf(tmpbuf,"%.*f",dec,d);
 
-       if (!isdigit(tmpbuf[0])) {
+       if (!isdigit((int)tmpbuf[0])) {
                return tmpbuf;
        }