diff --git a/lib/pen.js b/lib/pen.js
index 47f8c1f..4bfed02 100644
--- a/lib/pen.js
+++ b/lib/pen.js
@@ -547,7 +547,7 @@ export default class Painter {
       }
       let lineIndex = 0;
       for (let j = 0; j < textArray.length; ++j) {
-        const preLineLength = Math.ceil(textArray[j].length / linesArray[j]);
+        const preLineLength = Math.floor(textArray[j].length / linesArray[j]);
         let start = 0;
         let alreadyCount = 0;
         for (let i = 0; i < linesArray[j]; ++i) {
diff --git a/painter.js b/painter.js
index 786cc84..3d35aec 100644
--- a/painter.js
+++ b/painter.js
@@ -830,4 +830,4 @@ function setStringPrototype(screenK, scale) {
     }
     return res;
   };
-}
+}
\ No newline at end of file