diff --git a/llarp/config.hpp b/llarp/config.hpp
index e16ff7a59..93ad42aca 100644
--- a/llarp/config.hpp
+++ b/llarp/config.hpp
@@ -3,6 +3,7 @@
 
 #include <forward_list>
 #include <string>
+#include <functional>
 
 namespace llarp
 {