diff --git a/ADOL-C/include/adolc/advalue.h b/ADOL-C/include/adolc/advalue.h
index 7648a954..3b128729 100644
--- a/ADOL-C/include/adolc/advalue.h
+++ b/ADOL-C/include/adolc/advalue.h
@@ -1010,6 +1010,7 @@ auto sqrt(const X& x)
       return 1./(2.*sqrt(x));
     if constexpr (order==2)
       return -1./(4.*x*sqrt(x));
+    static_assert(order <= 2, "Only derivatives up to order 2 are implemented");
   });
 }