diff --git a/dune/tectonic/nicefunction.hh b/dune/tectonic/nicefunction.hh
index f76235862b2d0d35278b6c76099123474b99141f..9a2446da6f99808bd06f480a7d0c42f563de29a7 100644
--- a/dune/tectonic/nicefunction.hh
+++ b/dune/tectonic/nicefunction.hh
@@ -2,6 +2,7 @@
 #define NICE_FUNCTION_HH
 
 #include <algorithm>
+#include <cassert>
 #include <cmath>
 #include <limits>