diff --git a/src/Buffer.ts b/src/Buffer.ts
index 7b3bcee5..0ad86bf1 100644
--- a/src/Buffer.ts
+++ b/src/Buffer.ts
@@ -228,8 +228,9 @@ export class Buffer implements IBuffer {
       }
       const length = (trimRight) ? line.getTrimmedLength() : line.length;
       for (let i = 0; i < length; ++i) {
-        if (line.get(i)[CHAR_DATA_WIDTH_INDEX])
-          stringIndex -= line.get(i)[CHAR_DATA_CHAR_INDEX].length || 1;
+        if (line.get(i)[CHAR_DATA_WIDTH_INDEX]) {
+          stringIndex -= line.get(i)[CHAR_DATA_CHAR_INDEX].length || 1; // WHITESPACE_CELL_CHAR.length
+        }
         if (stringIndex < 0) {
           return [lineIndex, i];
         }