diff --git a/base/include/hidl/TaskRunner.h b/base/include/hidl/TaskRunner.h
index 6a79ebf..f3ea92f 100644
--- a/base/include/hidl/TaskRunner.h
+++ b/base/include/hidl/TaskRunner.h
@@ -16,6 +16,7 @@
 #ifndef ANDROID_HIDL_TASK_RUNNER_H
 #define ANDROID_HIDL_TASK_RUNNER_H
 
+#include <functional>
 #include <memory>
 #include <thread>