diff --git a/CMakeLists.txt b/CMakeLists.txt
index d93e8e8a..3f6afb74 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -80,7 +80,7 @@ elseif(UNIX)
 	#	set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS}")
 	#endif()
 	
-	add_definitions(-DLINUX -D_REENTRANT -Dlinux -DSTELLA_INTERNAL -D_USING_STL -D_GNU_SOURCE -D_XOPEN_SOURCE=500)
+	add_definitions(-DLINUX -D_REENTRANT -Dlinux -DSTELLA_INTERNAL -D_GNU_SOURCE -D_XOPEN_SOURCE=500)
 endif()
 
 add_subdirectory(external)