diff --git a/lib/Fuzzer/test/cxxstring.test b/lib/Fuzzer/test/cxxstring.test
index c60d7aee968..52168fc8c82 100644
--- a/lib/Fuzzer/test/cxxstring.test
+++ b/lib/Fuzzer/test/cxxstring.test
@@ -1,2 +1,4 @@
+UNSUPPORTED: windows
+
 RUN: not LLVMFuzzer-CxxStringEqTest -seed=1 -runs=1000000 2>&1 | FileCheck %s
 CHECK: BINGO