diff --git a/src/lib/base/PriorityQueue.h b/src/lib/base/PriorityQueue.h
index be33a2737..ee7351619 100644
--- a/src/lib/base/PriorityQueue.h
+++ b/src/lib/base/PriorityQueue.h
@@ -8,7 +8,6 @@
 #pragma once
 
 #include <algorithm>
-#include <functional>
 #include <vector>
 
 //! A priority queue with an iterator