diff --git a/src/optimization/Cancellation.cpp b/src/optimization/Cancellation.cpp
index 3b6512ba..73ed5128 100644
--- a/src/optimization/Cancellation.cpp
+++ b/src/optimization/Cancellation.cpp
@@ -1,4 +1,5 @@
     #include <atomic>
+    #include "optimization/Cancellation.h"
     std::atomic<int>& GetCancellationFlag() {
         static std::atomic<int> flag;
         return flag;