diff --git a/src/loadSimu.hpp b/src/loadSimu.hpp
index 8e4c507..7a72259 100644
--- a/src/loadSimu.hpp
+++ b/src/loadSimu.hpp
@@ -77,7 +77,7 @@ namespace CosmoTool
       if (i == attributes.end())
 	return 0;
       
-      return reinterpret_cast<T *>(i->first);
+      return reinterpret_cast<T *>(i->second.first);
     }
 
     void new_attribute(const std::string& n, void *p, FreeFunction free_func)
diff --git a/src/yorick_nc3.cpp b/src/yorick_nc3.cpp
index d760009..92d55b6 100644
--- a/src/yorick_nc3.cpp
+++ b/src/yorick_nc3.cpp
@@ -151,7 +151,7 @@ namespace CosmoTool {
   ProgressiveOutput<T>::saveArrayProgressive(const std::string& fname, uint32_t *dimList,
 					     uint32_t rank)
   {
-    NcFile *f = new NcFile(fname.c_str(), NcFile::Replace);
+    NcFile *f = new NcFile(fname.c_str(), NcFile::Replace, 0, 0, NcFile::Netcdf4);
     
     assert(f->is_valid());
     
@@ -202,7 +202,7 @@ namespace CosmoTool {
   void saveArray(const std::string& fname,
 		 T *array, uint32_t *dimList, uint32_t rank)
   {
-    NcFile f(fname.c_str(), NcFile::Replace);
+    NcFile f(fname.c_str(), NcFile::Replace, 0, 0, NcFile::Netcdf4);
     
     assert(f.is_valid());