diff --git a/compiler-rt/test/fuzzer/big-file-copy.test b/compiler-rt/test/fuzzer/big-file-copy.test
--- a/compiler-rt/test/fuzzer/big-file-copy.test
+++ b/compiler-rt/test/fuzzer/big-file-copy.test
@@ -1,3 +1,4 @@
+REQUIRES: darwin
 RUN: %cpp_compiler %S/BigFileCopy.cpp -o %t
 RUN: %run %t -runs=1 -rss_limit_mb=4096 2>big-file-out.txt; result=$?
 RUN: %run rm -f big-file.txt big-file-out.txt