diff --git a/packages/mermaid/src/diagrams/sequence/sequenceDb.ts b/packages/mermaid/src/diagrams/sequence/sequenceDb.ts
index 7a2c3f730..1520daf4a 100644
--- a/packages/mermaid/src/diagrams/sequence/sequenceDb.ts
+++ b/packages/mermaid/src/diagrams/sequence/sequenceDb.ts
@@ -256,7 +256,7 @@ export const disableSequenceNumbers = function () {
 };
 export const showSequenceNumbers = () => state.records.sequenceNumbersEnabled;
 
-export const setWrap = function (wrapSetting: boolean) {
+export const setWrap = function (wrapSetting?: boolean) {
   state.records.wrapEnabled = wrapSetting;
 };