Add a missing include

diff --git a/include/deal.II/numerics/vector_tools_interpolate.h b/include/deal.II/numerics/vector_tools_interpolate.h
index 6afd72e4db75e66a42e84b736a21dfb58b2db229..9880f4ae4e59ad89e70f04d638d870ce64684bb3 100644 (file)
--- a/include/deal.II/numerics/vector_tools_interpolate.h
+++ b/include/deal.II/numerics/vector_tools_interpolate.h
@@ -17,6 +17,8 @@
 
 #include <deal.II/base/config.h>
 
+#include <deal.II/base/template_constraints.h>
+
 #include <deal.II/fe/component_mask.h>
 
 #include <map>