diff --git a/tests/slic3rutils/test_printer_agent.cpp b/tests/slic3rutils/test_printer_agent.cpp
index 088e319f5d..f221ea391e 100644
--- a/tests/slic3rutils/test_printer_agent.cpp
+++ b/tests/slic3rutils/test_printer_agent.cpp
@@ -1,5 +1,6 @@
 #include <catch2/catch_all.hpp>
 
+#include <functional>
 #include <slic3r/Utils/BBLPrinterAgent.hpp>
 #include <slic3r/Utils/IPrinterAgent.hpp>
 #include <slic3r/Utils/MoonrakerPrinterAgent.hpp>