diff --git a/clang/test/ClangScanDeps/P1689.cppm b/clang/test/ClangScanDeps/P1689.cppm
index 22d7721c2e9bf1..3329d1efbfa639 100644
--- a/clang/test/ClangScanDeps/P1689.cppm
+++ b/clang/test/ClangScanDeps/P1689.cppm
@@ -1,3 +1,5 @@
+// UNSUPPORTED: system-windows
+
 // RUN: rm -fr %t
 // RUN: mkdir -p %t
 // RUN: split-file %s %t