diff --git a/Library/Homebrew/formula.rb b/Library/Homebrew/formula.rb
index 4d3c143dce..69cab88c47 100644
--- a/Library/Homebrew/formula.rb
+++ b/Library/Homebrew/formula.rb
@@ -1167,7 +1167,7 @@ class Formula
   # Returns false if the formula wasn't installed with an alias.
   def installed_alias_target_changed?
     target = current_installed_alias_target
-    target && target != self
+    target && target.name != name
   end
 
   # Is this formula the target of an alias used to install an old formula?
@@ -1192,7 +1192,7 @@ class Formula
     # it doesn't make sense to say that other formulae are older versions of it
     # because we don't know which came first.
     return [] if alias_path.nil? || installed_alias_target_changed?
-    self.class.installed_with_alias_path(alias_path) - [self]
+    self.class.installed_with_alias_path(alias_path).reject { |f| f.name == name }
   end
 
   # @private
diff --git a/Library/Homebrew/test/test_formula.rb b/Library/Homebrew/test/test_formula.rb
index 37d3f0f596..a12983e4ce 100644
--- a/Library/Homebrew/test/test_formula.rb
+++ b/Library/Homebrew/test/test_formula.rb
@@ -799,8 +799,8 @@ end
 class AliasChangeTests < Homebrew::TestCase
   attr_reader :f, :new_formula, :tab, :alias_path
 
-  def make_formula(version)
-    f = formula(alias_path: alias_path) { url "foo-#{version}" }
+  def make_formula(name, version)
+    f = formula(name, alias_path: alias_path) { url "foo-#{version}" }
     f.build = tab
     f
   end
@@ -811,8 +811,8 @@ class AliasChangeTests < Homebrew::TestCase
 
     @tab = Tab.empty
 
-    @f = make_formula("1.0")
-    @new_formula = make_formula("1.1")
+    @f = make_formula("formula_name", "1.0")
+    @new_formula = make_formula("new_formula_name", "1.1")
 
     Formula.stubs(:installed).returns([f])
   end