diff --git a/src/DATA/TOOLS/ConvertDDTimeToDouble.c b/src/DATA/TOOLS/ConvertDDTimeToDouble.c
index 96265cf..4fc1dd7 100755
--- a/src/DATA/TOOLS/ConvertDDTimeToDouble.c
+++ b/src/DATA/TOOLS/ConvertDDTimeToDouble.c
@@ -278,7 +278,7 @@ int convertNCFile(char* oldFilePath, char* newFilePath) {
 
    //Create new file
    int newFileId;
-   status = nc_create(newFilePath, NC_CLOBBER, &newFileId);
+   status = nc_create(newFilePath, NC_CLOBBER | NC_NETCDF4, &newFileId);
 
    if (status != NC_NOERR) {
       fprintf(stderr,"Cannot create NC file %s %s\n",newFilePath,nc_strerror(status));
--
libgit2 0.21.2