diff --git a/src/HDF5.jl b/src/HDF5.jl
index 7bfc87d79..cb3701b40 100644
--- a/src/HDF5.jl
+++ b/src/HDF5.jl
@@ -1491,7 +1491,8 @@ end
 # get a vector of all the leaf types in a (possibly nested) named tuple
 function get_all_types(::Type{NamedTuple{T, U}}) where T where U
   types = []
-  for Ui in fieldtypes(U)
+  for i in 1:fieldcount(U)
+    Ui = fieldtype(U, i)
     if Ui <: NamedTuple
       append!(types, get_all_types(Ui))
     else