diff --git a/cartographer/common/task_test.cc b/cartographer/common/task_test.cc
index 896dbb1..390a9c0 100644
--- a/cartographer/common/task_test.cc
+++ b/cartographer/common/task_test.cc
@@ -20,6 +20,7 @@
 #include <queue>
 
 #include "absl/memory/memory.h"
+#include "cartographer/common/thread_pool.h"
 #include "gmock/gmock.h"
 #include "gtest/gtest.h"