diff --git a/src/scripting/backend/vmbuilder.h b/src/scripting/backend/vmbuilder.h
index 07ba89ad4f..7531e4eff1 100644
--- a/src/scripting/backend/vmbuilder.h
+++ b/src/scripting/backend/vmbuilder.h
@@ -4,6 +4,7 @@
 #include "dobject.h"
 #include "vmintern.h"
 #include <vector>
+#include <functional>
 
 class VMFunctionBuilder;
 class FxExpression;