diff --git a/compiler-rt/lib/tsan/lit_tests/oob_race.cc b/compiler-rt/lib/tsan/lit_tests/oob_race.cc
index 9d8e2220d9a5..c84e819cbe79 100644
--- a/compiler-rt/lib/tsan/lit_tests/oob_race.cc
+++ b/compiler-rt/lib/tsan/lit_tests/oob_race.cc
@@ -1,10 +1,12 @@
 // RUN: %clangxx_tsan -O1 %s -o %t && not %t 2>&1 | FileCheck %s
 #include <pthread.h>
 #include <stdio.h>
+#include <unistd.h>
 
 const long kOffset = 64*1024;
 
 void *Thread(void *p) {
+  sleep(1);
   ((char*)p)[-kOffset] = 43;
   return 0;
 }
diff --git a/compiler-rt/lib/tsan/lit_tests/race_on_read.cc b/compiler-rt/lib/tsan/lit_tests/race_on_read.cc
index 4ca4b25bfa81..e870ff9e83c6 100644
--- a/compiler-rt/lib/tsan/lit_tests/race_on_read.cc
+++ b/compiler-rt/lib/tsan/lit_tests/race_on_read.cc
@@ -5,11 +5,13 @@
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
+#include <unistd.h>
 
 int fd;
 char buf;
 
 void *Thread(void *x) {
+  sleep(1);
   read(fd, &buf, 1);
   return NULL;
 }