1 files changed, 1 insertions, 1 deletions
diff --git a/mrblib/range.rb b/mrblib/range.rb
index 36886d50c..b02fad2b6 100644
--- a/mrblib/range.rb
+++ b/mrblib/range.rb
@@ -15,7 +15,7 @@ class Range
     val = self.begin
     last = self.end
 
-    if val.kind_of?(Fixnum) && last.nil?
+    if val.kind_of?(Integer) && last.nil?
       i = val
       while true
         block.call(i)