diff --git a/llvm/lib/Fuzzer/test/fuzzer-jobs.test b/llvm/lib/Fuzzer/test/fuzzer-jobs.test
index 5bf8cfadfb75a..035c3afdf6928 100644
--- a/llvm/lib/Fuzzer/test/fuzzer-jobs.test
+++ b/llvm/lib/Fuzzer/test/fuzzer-jobs.test
@@ -1,3 +1,5 @@
+REQUIRES: posix
+
 RUN: rm -rf %tmp
 RUN: mkdir %tmp && cd %tmp
 # Create a shared corpus directory