diff --git a/src/chart/pie/labelLayout.ts b/src/chart/pie/labelLayout.ts
index 934b49cadc..5052ca236b 100644
--- a/src/chart/pie/labelLayout.ts
+++ b/src/chart/pie/labelLayout.ts
@@ -89,7 +89,7 @@ function adjustSingleSide(
             const rA = r + item.len;
             const rA2 = rA * rA;
             // Use ellipse implicit function to calculate x
-            const dx = Math.sqrt((1 - Math.abs(dy * dy / rB2)) * rA2);
+            const dx = Math.sqrt(Math.abs((1 - dy * dy / rB2) * rA2));
             const newX = cx + (dx + item.len2) * dir;
             const deltaX = newX - item.label.x;
             const newTargetWidth = item.targetTextWidth - deltaX * dir;