diff --git a/.Rbuildignore b/.Rbuildignore
index b320a05571bd3c450b5b1f2e522261ba923fc601..90018c782d3ac1075895bbfa778c1248ae5259dd 100644
--- a/.Rbuildignore
+++ b/.Rbuildignore
@@ -6,7 +6,7 @@
 ^README\.md$
 #\..*\.RData$
 #^vignettes$
-^tests$
+#^tests$
 ^inst/doc$
 #^inst/doc/*$
 #^inst/doc/figures/$
diff --git a/R/NcDataReader.R b/R/NcDataReader.R
index ebc58fc27c6a6c5a379e9773de1ffe27bed2ecc3..fb61ef8e8171f04b3b893d0136a12843cbbed2a5 100644
--- a/R/NcDataReader.R
+++ b/R/NcDataReader.R
@@ -183,7 +183,7 @@ NcDataReader <- function(file_path = NULL, file_object = NULL,
         }
       })
 
-    if (length(names(attr(result, 'variables'))) == 1) {
+    if (length(names(attr(result, 'variables'))) == 1 & all(names(attr(result, 'variables')) == 'time')) {
       var_name <- names(attr(result, 'variables'))
       units <- attr(result, 'variables')[[var_name]][['units']]