diff --git a/lib/linguist.rb b/lib/linguist.rb
index 3929efb9..589869c6 100644
--- a/lib/linguist.rb
+++ b/lib/linguist.rb
@@ -13,8 +13,8 @@ class << Linguist
   def instrument(*args, &bk)
     if instrumenter
       instrumenter.instrument(*args, &bk)
-    else
-      yield if block_given?
+    elsif block_given?
+      yield
     end
   end
 end
diff --git a/lib/linguist/lazy_blob.rb b/lib/linguist/lazy_blob.rb
index 28fb78f3..e828dca6 100644
--- a/lib/linguist/lazy_blob.rb
+++ b/lib/linguist/lazy_blob.rb
@@ -86,8 +86,8 @@ module Linguist
     protected
 
     # Returns true if the attribute is present and not the string "false".
-    def boolean_attribute(attr)
-      attr != "false"
+    def boolean_attribute(attribute)
+      attribute != "false"
     end
 
     def load_blob!