diff --git a/src/parse/preprocess.ts b/src/parse/preprocess.ts
index 6241f6e..5ce5bb4 100644
--- a/src/parse/preprocess.ts
+++ b/src/parse/preprocess.ts
@@ -3,7 +3,6 @@ import {
   parse,
   type Range,
   replaceContents,
-  sliceByteRange,
 } from '../utils/content-tag.js';
 
 export interface Template {
@@ -39,7 +38,7 @@ export function preprocessTemplateRange(
     prefix = '{/*';
     suffix = '*/}';
 
-    const nextToken = sliceByteRange(code, template.range.endByte).match(/\S+/);
+    const nextToken = code.slice(template.range.endChar).match(/\S+/);
 
     if (nextToken && (nextToken[0] === 'as' || nextToken[0] === 'satisfies')) {
       // Replace with parenthesized ObjectExpression
@@ -70,8 +69,8 @@ export function codeToGlimmerAst(code: string, filename: string): Template[] {
     const { contentRange, contents, range, type } = contentTag;
 
     const utf16Range = {
-      end: sliceByteRange(code, 0, range.endByte).length,
-      start: sliceByteRange(code, 0, range.startByte).length,
+      end: code.slice(0, range.endChar).length,
+      start: code.slice(0, range.startChar).length,
     };
 
     return {
diff --git a/src/utils/content-tag.ts b/src/utils/content-tag.ts
index 6623444..d009928 100644
--- a/src/utils/content-tag.ts
+++ b/src/utils/content-tag.ts
@@ -38,20 +38,10 @@ export function replaceContents(
   const { contents, range } = options;
 
   return [
-    sliceByteRange(file, 0, range.startByte),
+    file.slice(0, range.startChar),
     contents,
-    sliceByteRange(file, range.endByte),
+    file.slice(range.endChar),
   ].join('');
 }
 
-export function sliceByteRange(
-  string_: string,
-  indexStart: number,
-  indexEnd?: number,
-): string {
-  const buffer = getBuffer(string_);
-
-  return buffer.slice(indexStart, indexEnd).toString();
-}
-
 export type { ContentTag, Range };