diff --git a/src/client/common/configSettings.ts b/src/client/common/configSettings.ts
index 2aea9ff5765..b0c75f532df 100644
--- a/src/client/common/configSettings.ts
+++ b/src/client/common/configSettings.ts
@@ -98,7 +98,7 @@ export class JupyterSettings implements IWatchableJupyterSettings {
     public showVariableViewWhenDebugging: boolean = true;
     public newCellOnRunLast: boolean = true;
     public pylanceHandlesNotebooks: boolean = false;
-    public pythonCompletionTriggerCharacters: string | undefined;
+    public pythonCompletionTriggerCharacters: string = '';
 
     public variableTooltipFields: IVariableTooltipFields = {
         python: {