diff --git a/compiler-rt/test/tsan/Darwin/external.cc b/compiler-rt/test/tsan/Darwin/external.cc
index f1c6ebb802f8..3c5e71a0f8f0 100644
--- a/compiler-rt/test/tsan/Darwin/external.cc
+++ b/compiler-rt/test/tsan/Darwin/external.cc
@@ -17,6 +17,7 @@
 #include <dlfcn.h>
 #include <pthread.h>
 #include <stdio.h>
+#include <stdlib.h>
 
 struct MyObject;
 typedef MyObject *MyObjectRef;