diff --git a/CMakeLists.txt b/CMakeLists.txt
index 07bc24ff..c9f7f878 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -74,6 +74,7 @@ set(PYBIND11_HEADERS
   include/pybind11/numpy.h
   include/pybind11/complex.h
   include/pybind11/stl.h
+  include/pybind11/functional.h
 )
 
 # Create the binding library