diff --git a/src/Logging/TeamCity/TeamCityLogger.php b/src/Logging/TeamCity/TeamCityLogger.php
index 4834bff4e22..c7062128f81 100644
--- a/src/Logging/TeamCity/TeamCityLogger.php
+++ b/src/Logging/TeamCity/TeamCityLogger.php
@@ -296,7 +296,7 @@ private function writeMessage(string $eventName, array $parameters = []): void
     {
         $this->printer->print(
             sprintf(
-                "##teamcity[%s",
+                '##teamcity[%s',
                 $eventName,
             ),
         );