diff --git a/python/dune/perftool/loopy/mangler.py b/python/dune/perftool/loopy/mangler.py
index a411512251df091e9d61403579a0893faf4d456d..ba5b24aef7bf259c95f98bc5018b1f527c613864 100644
--- a/python/dune/perftool/loopy/mangler.py
+++ b/python/dune/perftool/loopy/mangler.py
@@ -19,13 +19,13 @@ def dune_math_manglers(kernel, name, arg_dtypes):
     dt = arg_dtypes[0]
     if name == "exp":
         include_file("dune/perftool/common/vectorclass.hh", filetag="operatorfile")
-        return CallMangleInfo("exp",
+        return CallMangleInfo(add_std("exp", dt),
                               arg_dtypes,
                               arg_dtypes,
                               )
 
     if name == "sqrt":
-        return CallMangleInfo("sqrt",
+        return CallMangleInfo(add_std("sqrt", dt),
                               arg_dtypes,
                               arg_dtypes,
                               )