Index: bltinmodule.c
===================================================================
--- bltinmodule.c	(revision 65124)
+++ bltinmodule.c	(working copy)
@@ -2109,6 +2109,7 @@
 builtin_round(PyObject *self, PyObject *args, PyObject *kwds)
 {
 	double number;
+	double integral,fraction;
 	double f;
 	int ndigits = 0;
 	int i;
@@ -2121,18 +2122,27 @@
 	i = abs(ndigits);
 	while  (--i >= 0)
 		f = f*10.0;
-	if (ndigits < 0)
+
+	if (ndigits < 0) {
 		number /= f;
-	else
+		if (number >= 0.0)
+			number = floor(number + 0.5);
+		else
+			number = ceil(number - 0.5);
 		number *= f;
-	if (number >= 0.0)
-		number = floor(number + 0.5);
-	else
-		number = ceil(number - 0.5);
-	if (ndigits < 0)
-		number *= f;
-	else
-		number /= f;
+	}
+	else {
+	        /*break double apart to avoid overflow*/
+		fraction=modf(number, &integral);
+		fraction *= f;
+		if (number >= 0.0)
+			fraction = floor(fraction + 0.5);
+		else
+			fraction = ceil(fraction - 0.5);
+		fraction /= f;
+		number=integral+fraction;
+	}
+
 	return PyFloat_FromDouble(number);
 }