diff --git a/clang/test/Format/clang-format-ignore.cpp b/clang/test/Format/clang-format-ignore.cpp
index 5a2267b302d22f..3e09fe59fa2120 100644
--- a/clang/test/Format/clang-format-ignore.cpp
+++ b/clang/test/Format/clang-format-ignore.cpp
@@ -1,3 +1,4 @@
+// UNSUPPORTED: system-windows
 // RUN: rm -rf %t.dir
 // RUN: mkdir -p %t.dir/level1/level2