diff --git a/cadabra2-include-functional-header.patch b/cadabra2-include-functional-header.patch
deleted file mode 100644
index ffbd216..0000000
--- a/cadabra2-include-functional-header.patch
+++ /dev/null
@@ -1,12 +0,0 @@
-Index: cadabra2-2.1.4/core/Functional.hh
-===================================================================
---- cadabra2-2.1.4.orig/core/Functional.hh
-+++ cadabra2-2.1.4/core/Functional.hh
-@@ -1,6 +1,7 @@
- 
- #pragma once
- 
-+#include <functional>
- #include "Storage.hh"
- 
- namespace cadabra {