diff --git a/runtime/utils.cc b/runtime/utils.cc
index 39a051c..68d8417 100644
--- a/runtime/utils.cc
+++ b/runtime/utils.cc
@@ -21,6 +21,8 @@
 #include <sys/stat.h>
 #include <sys/syscall.h>
 #include <sys/types.h>
+#include <sys/wait.h>
+
 #include <unistd.h>
 
 #include "UniquePtr.h"