diff --git a/src/packet_analysis/Component.h b/src/packet_analysis/Component.h
index 1a93e4cc76..59ccb66515 100644
--- a/src/packet_analysis/Component.h
+++ b/src/packet_analysis/Component.h
@@ -3,6 +3,9 @@
 #pragma once
 
 #include "zeek-config.h"
+
+#include <functional>
+
 #include "util.h"
 #include "Tag.h"