diff --git a/lib/gchart.rb b/lib/gchart.rb
index 8b61268..cfb3953 100644
--- a/lib/gchart.rb
+++ b/lib/gchart.rb
@@ -504,7 +504,7 @@ def set_axis_range
     # a passed axis_range should look like:
     # [[10,100]] or [[10,100,4]] or [[10,100], [20,300]]
     # in the second example, 4 is the interval 
-    set = @calculated_axis_range ? datasets : axis_range || datasets
+    set = @calculated_axis_range ? axis_range : datasets || datasets
 
     return unless set && set.respond_to?(:each) && set.find {|o| o}.respond_to?(:each)