diff --git a/llvm/lib/Fuzzer/test/equivalence.test b/llvm/lib/Fuzzer/test/equivalence.test
index 2728447e34a7..c9b5f690202e 100644
--- a/llvm/lib/Fuzzer/test/equivalence.test
+++ b/llvm/lib/Fuzzer/test/equivalence.test
@@ -1,3 +1,5 @@
+REQUIRES: posix
+
 RUN: LLVMFuzzer-EquivalenceATest -run_equivalence_server=EQUIV_TEST & export APID=$!
 RUN: sleep 3
 RUN: not LLVMFuzzer-EquivalenceBTest -use_equivalence_server=EQUIV_TEST -max_len=4096 2>&1 | FileCheck %s