diff --git a/lib/doc/workbook.js b/lib/doc/workbook.js
index 2373a5b58..bee0e5360 100644
--- a/lib/doc/workbook.js
+++ b/lib/doc/workbook.js
@@ -51,7 +51,7 @@ class Workbook {
console.warn(`Worksheet name ${name} exceeds 31 chars. This will be truncated`);
}
name = (name || `sheet${id}`).substring(0, 31);
- if (this._worksheets.find(ws => ws && ws.name === name)) {
+ if (this._worksheets.find(ws => ws && ws.name.toLowerCase() === name.toLowerCase())) {
throw new Error(`Worksheet name already exists: ${name}`);
}
diff --git a/spec/integration/worksheet.spec.js b/spec/integration/worksheet.spec.js
index 40bf6c98f..2e1b81225 100644
--- a/spec/integration/worksheet.spec.js
+++ b/spec/integration/worksheet.spec.js
@@ -403,6 +403,18 @@ describe('Worksheet', () => {
});
context('when worksheet name already exists', () => {
+ it('throws an error', () => {
+ const wb = new ExcelJS.Workbook();
+
+ const validName = 'thisisaworksheetnameinuppercase';
+ const invalideName = 'THISISAWORKSHEETNAMEINUPPERCASE';
+ const expectedError = `Worksheet name already exists: ${invalideName}`;
+
+ wb.addWorksheet(validName);
+
+ expect(() => wb.addWorksheet(invalideName)).to.throw(expectedError);
+ });
+
it('throws an error', () => {
const wb = new ExcelJS.Workbook();
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