diff --git a/linphone-app/CMakeLists.txt b/linphone-app/CMakeLists.txt
index 20ac1cd10..d4b9015d2 100644
--- a/linphone-app/CMakeLists.txt
+++ b/linphone-app/CMakeLists.txt
@@ -84,7 +84,7 @@ if (UNIX AND NOT APPLE)
     list(APPEND QT5_PACKAGES DBus)
 endif ()
 if(ENABLE_TEXT_TO_SPEECH)
-	#set(QT5_PACKAGES_OPTIONAL TextToSpeech)
+	set(QT5_PACKAGES_OPTIONAL TextToSpeech)
 endif()
 set(CMAKE_AUTOMOC ON)