diff --git a/ui/include/classes/graphdraw/CPieGraphDraw.php b/ui/include/classes/graphdraw/CPieGraphDraw.php
index b45abd70cc4..69ece255337 100644
--- a/ui/include/classes/graphdraw/CPieGraphDraw.php
+++ b/ui/include/classes/graphdraw/CPieGraphDraw.php
@@ -470,7 +470,12 @@ class CPieGraphDraw extends CGraphDraw {
 				continue;
 			}
 
-			$angleend += (int) (360 * $value / $sum) + 1;
+			$angleend += (int) (360 * $value / $sum);
+
+			if ($angleend > 0) {
+				$angleend += 1;
+			}
+
 			$angleend = ($angleend > 360) ? 360 : $angleend;
 
 			if (($angleend - $anglestart) < 1) {
@@ -552,7 +557,12 @@ class CPieGraphDraw extends CGraphDraw {
 				continue;
 			}
 
-			$angleend += (int) (360 * $value / $sum) + 1;
+			$angleend += (int) (360 * $value / $sum);
+
+			if ($angleend > 0) {
+				$angleend += 1;
+			}
+
 			$angleend = ($angleend > 360) ? 360 : $angleend;
 
 			if (($angleend - $anglestart) < 1) {
@@ -598,7 +608,12 @@ class CPieGraphDraw extends CGraphDraw {
 					continue;
 				}
 
-				$angleend += (int) (360 * $value / $sum) + 1;
+				$angleend += (int) (360 * $value / $sum);
+
+				if ($angleend > 0) {
+					$angleend += 1;
+				}
+
 				$angleend = ($angleend > 360) ? 360 : $angleend;
 
 				if (($angleend - $anglestart) < 1) {
@@ -635,7 +650,12 @@ class CPieGraphDraw extends CGraphDraw {
 				continue;
 			}
 
-			$angleend += (int) (360 * $value / $sum) + 1;
+			$angleend += (int) (360 * $value / $sum);
+
+			if ($angleend > 0) {
+				$angleend += 1;
+			}
+
 			$angleend = ($angleend > 360) ? 360 : $angleend;
 
 			if (($angleend - $anglestart) < 1) {