diff --git a/src/harmonicmaps.cc b/src/harmonicmaps.cc
index fd2e24a6f2651a60b50ada51883bb2963e0e0c26..22341360bcbdede6c5065b9581ad945034209ddd 100644
--- a/src/harmonicmaps.cc
+++ b/src/harmonicmaps.cc
@@ -23,6 +23,7 @@
 #include <dune/functions/gridfunctions/discreteglobalbasisfunction.hh>
 #include <dune/functions/functionspacebases/pqknodalbasis.hh>
 #include <dune/functions/functionspacebases/bsplinebasis.hh>
+#include <dune/functions/functionspacebases/interpolate.hh>
 
 #include <dune/fufem/boundarypatch.hh>
 #include <dune/fufem/functiontools/basisinterpolator.hh>