diff --git a/ThirdParty/CMakeLists.txt b/ThirdParty/CMakeLists.txt
index 60c9040a57f70d9ede8bb5dea0132d87490bb393..d79259309c9d1c6c8234cee4bd4a986f979fbc09 100644
--- a/ThirdParty/CMakeLists.txt
+++ b/ThirdParty/CMakeLists.txt
@@ -11,16 +11,16 @@ ADD_SUBDIRECTORY(zlib)
 ADD_SUBDIRECTORY(gtest)
 
 # This is a workaround for Travis builds.
-OPTION(OGS_DONT_USE_OPTIONAL_SUBMODULES "Option for disabling optional submodules" OFF)
+OPTION(OGS_USE_OPTIONAL_SUBMODULES "Option for enabling optional submodules" OFF)
 
 # VtkFbxConverter
 IF(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/VtkFbxConverter/CMakeLists.txt
-	AND NOT OGS_DONT_USE_OPTIONAL_SUBMODULES)
+	AND OGS_USE_OPTIONAL_SUBMODULES)
 	ADD_SUBDIRECTORY(VtkFbxConverter)
 ENDIF()
 
 # VtkOsgConverter
 IF(EXISTS ${CMAKE_CURRENT_SOURCE_DIR}/VtkOsgConverter/CMakeLists.txt
-	AND NOT OGS_DONT_USE_OPTIONAL_SUBMODULES)
+	AND OGS_USE_OPTIONAL_SUBMODULES)
 	ADD_SUBDIRECTORY(VtkOsgConverter)
 ENDIF()
\ No newline at end of file