diff --git a/wc.rb b/wc.rb
index f0a3474..8b16a82 100644
--- a/wc.rb
+++ b/wc.rb
@@ -24,12 +24,11 @@ def count_file_stats(input)
 end
 
 def process_input(source)
-  input = if source == '-'
-            $stdin.read
-          else
-            File.read(source)
-          end
-  count_file_stats(input)
+  if source == '-'
+    count_file_stats(ARGF)
+  else
+    count_file_stats(File.read(source))
+  end
 end
 
 def update_totals(totals, stats)