diff --git a/math/CMakeLists.txt b/math/CMakeLists.txt
index 05eea5826a8361f285d991b0693fcd048f7d233c..e65848271204938bf2fb9aca81825600d6cfd299 100644
--- a/math/CMakeLists.txt
+++ b/math/CMakeLists.txt
@@ -27,6 +27,7 @@ set(fleur_F90 ${fleur_F90}
 math/differentiate.f90
 math/fft2d.F90
 math/fft3d.f90
+math/fft_interface.F90
 )
 if (FLEUR_USE_FFTMKL)
    set(fleur_F90 ${fleur_F90} math/mkl_dfti.f90)