diff --git a/Build.md b/Build.md
index 1bc2e3c..b30fe64 100644
--- a/Build.md
+++ b/Build.md
@@ -291,7 +291,7 @@ pacman -S mingw-w64-x86_64-clang mingw-w64-x86_64-clang-tools-extra mingw64/ming
 pacman -S cmake ninja clang
 # Download ccls
 cd ccls
-cmake -S. -BRelease -G Ninja -DCMAKE_CXX_FLAGS=-D__STDC_FORMAT_MACROS
+cmake -S. -BRelease -G Ninja -DCMAKE_CXX_FLAGS='-D_GLIBCXX_USE_CXX11_ABI=0'
 ninja -C Release
 ```