diff --git a/clang-tools-extra/test/clang-doc/long-name.cpp b/clang-tools-extra/test/clang-doc/long-name.cpp
index db96fc4aebe5a..e29c468ecc4da 100644
--- a/clang-tools-extra/test/clang-doc/long-name.cpp
+++ b/clang-tools-extra/test/clang-doc/long-name.cpp
@@ -1,3 +1,5 @@
+// FIXME: This test seems to break on windows, so disable it for now.
+// UNSUPPORTED: system-windows
 // RUN: rm -rf %t && mkdir -p %t
 // RUN: clang-doc --output=%t --format=mustache --executor=standalone %s
 // RUN: ls %t/json | FileCheck %s -check-prefix=CHECK-JSON