diff --git a/lldb/test/API/macosx/profile_vrs_detach/main.c b/lldb/test/API/macosx/profile_vrs_detach/main.c
index 6bcd3342441bd..939308414edcf 100644
--- a/lldb/test/API/macosx/profile_vrs_detach/main.c
+++ b/lldb/test/API/macosx/profile_vrs_detach/main.c
@@ -1,10 +1,11 @@
 #include <stdio.h>
+#include <unistd.h>
 
 int
 main()
 {
   while (1) {
-    sleep(1); // Set a breakpoint here 
+    sleep(1); // Set a breakpoint here
     printf("I slept\n");
   }
   return 0;