diff --git a/alert.go b/alert.go
index a432e62..dc93f97 100644
--- a/alert.go
+++ b/alert.go
@@ -71,8 +71,9 @@ func (a alert) DailyGraphURL() string {
 	return graphiteBase + "?target=" +
 		a.Metric + "&target=threshold(" +
 		fmt.Sprintf("%f", a.Threshold) +
-		")&width=" + fmt.Sprintf("%d", graphWidth) +
-		"&height=" + fmt.Sprintf("%d", dailyGraphHeight) +
+		")&width=" + fmt.Sprintf("%d", graphWidth * 2) +
+		"&height=" + fmt.Sprintf("%d", dailyGraphHeight * 2) +
+		"&fontSize=20" +
 		"&bgcolor=" + dailyBgColor +
 		"&fgcolor=" + fgColor + "&hideGrid=true&colorList=" +
 		dailyColorlist + "&from=-24hours"
@@ -82,8 +83,9 @@ func (a alert) WeeklyGraphURL() string {
 	return graphiteBase + "?target=" +
 		a.Metric + "&target=threshold(" +
 		fmt.Sprintf("%f", a.Threshold) +
-		")&width=" + fmt.Sprintf("%d", graphWidth) +
-		"&height=" + fmt.Sprintf("%d", weeklyGraphHeight) +
+		")&width=" + fmt.Sprintf("%d", graphWidth * 2) +
+		"&height=" + fmt.Sprintf("%d", weeklyGraphHeight * 2) +
+		"&fontSize=20" +
 		"&hideGrid=true&hideLegend=true&graphOnly=true&hideAxes=true&bgcolor=" +
 		weeklyBgColor + "&fgcolor=" + fgColor +
 		"&hideGrid=true&colorList=" + weeklyColorlist + "&from=-7days"
diff --git a/alert_test.go b/alert_test.go
index 2aae88c..0201bd8 100644
--- a/alert_test.go
+++ b/alert_test.go
@@ -39,14 +39,14 @@ func Test_URL(t *testing.T) {
 
 func Test_DailyGraphURL(t *testing.T) {
 	a := newAlert("foo", "foo", "", 10, "above", DummyFetcher{}, "test@example.com", "")
-	if a.DailyGraphURL() != "?target=foo&target=threshold(10.000000)&width=800&height=150&bgcolor=FFFFFF&fgcolor=000000&hideGrid=true&colorList=%23999999,%23006699&from=-24hours" {
+	if a.DailyGraphURL() != "?target=foo&target=threshold(10.000000)&width=1600&height=300&fontSize=20&bgcolor=FFFFFF&fgcolor=000000&hideGrid=true&colorList=%23999999,%23006699&from=-24hours" {
 		t.Error(fmt.Sprintf("wrong value: %s", a.DailyGraphURL()))
 	}
 }
 
 func Test_WeeklyGraphURL(t *testing.T) {
 	a := newAlert("foo", "foo", "", 10, "above", DummyFetcher{}, "test@example.com", "")
-	if a.WeeklyGraphURL() != "?target=foo&target=threshold(10.000000)&width=800&height=75&hideGrid=true&hideLegend=true&graphOnly=true&hideAxes=true&bgcolor=EEEEEE&fgcolor=000000&hideGrid=true&colorList=%23cccccc,%236699cc&from=-7days" {
+	if a.WeeklyGraphURL() != "?target=foo&target=threshold(10.000000)&width=1600&height=150&fontSize=20&hideGrid=true&hideLegend=true&graphOnly=true&hideAxes=true&bgcolor=EEEEEE&fgcolor=000000&hideGrid=true&colorList=%23cccccc,%236699cc&from=-7days" {
 		t.Error(fmt.Sprintf("wrong value: %s", a.WeeklyGraphURL()))
 	}
 }