diff --git a/arduino-ide-extension/src/node/core-service-impl.ts b/arduino-ide-extension/src/node/core-service-impl.ts
index f0319f511..8d538b257 100644
--- a/arduino-ide-extension/src/node/core-service-impl.ts
+++ b/arduino-ide-extension/src/node/core-service-impl.ts
@@ -96,7 +96,7 @@ export class CoreServiceImpl extends CoreClientAware implements CoreService {
         e.details
       );
       this.responseService.appendToOutput({
-        chunk: `${errorMessage}}\n`,
+        chunk: `${errorMessage}\n`,
         severity: 'error',
       });
       throw new Error(errorMessage);