diff --git a/cpp/ycm/CMakeLists.txt b/cpp/ycm/CMakeLists.txt
index 13a7aa21..00a23e6f 100644
--- a/cpp/ycm/CMakeLists.txt
+++ b/cpp/ycm/CMakeLists.txt
@@ -87,7 +87,7 @@ endif()
 
 # We want warnings if we accidentally use C++11 features
 if ( COMPILER_IS_CLANG )
-  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wc++11-extensions")
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wc++98-compat")
 endif()
 
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