diff --git a/stuff/math.hh b/stuff/math.hh
index 159268db4a634c924cf4f6ce95d696d1323ab6c1..c9429fe341a1cb2a6a4800a5a9c059f6c4e7b98b 100644
--- a/stuff/math.hh
+++ b/stuff/math.hh
@@ -1,12 +1,6 @@
 #ifndef DUNE_STUFF_MATH_HH
 #define DUNE_STUFF_MATH_HH
 
-template <typename T>
-bool isnan(T x)
-{
-  return !(x == x);
-}
-
 namespace Stuff {
 
 /** \todo DOCME **/