diff --git a/resolve_support/main.cc b/resolve_support/main.cc
index 06bd0ce6225ea55c2835761a8816fa3d7d31bad1..214f79dea26ec97c59a34aae015ce8b897f779c8 100644
--- a/resolve_support/main.cc
+++ b/resolve_support/main.cc
@@ -38,6 +38,7 @@ auto None = py::none();
 // Includes related to pybind11
 
 #include "ducc0/fft/fft.h"
+#include "ducc0/fft/fftnd_impl.h"
 #include "shape_helper.h"
 using namespace std;
 
diff --git a/setup.py b/setup.py
index cd41dde740faebb15308a017f62164aafa9f11ca..5a3bb4c1d1981fc9d583036162c190aae72b997e 100644
--- a/setup.py
+++ b/setup.py
@@ -121,6 +121,7 @@ extensions = [Extension("resolve_support",
                         sources=['resolve_support/main.cc',
                                  'resolve_support/ducc/src/ducc0/infra/threading.cc',
                                  'resolve_support/ducc/src/ducc0/infra/mav.cc',
+                                 'resolve_support/ducc/src/ducc0/infra/string_utils.cc',
                                  ],
                         depends=depfiles,
                         include_dirs=include_dirs,