1 files changed, 1 insertions, 0 deletions

diff --git a/cpp.h b/cpp.h
index 11588b8..3207ef9 100644
--- a/cpp.h
+++ b/cpp.h
@@ -7,6 +7,7 @@
 
 #include <any>
 #include <deque>
+#include <functional>
 #include <memory>
 #include <vector>