diff --git a/lib/acts_as_follower/followable.rb b/lib/acts_as_follower/followable.rb
index dda4c52..5f023ff 100644
--- a/lib/acts_as_follower/followable.rb
+++ b/lib/acts_as_follower/followable.rb
@@ -56,7 +56,7 @@ def method_missing(m, *args)
       end
 
       def respond_to?(m, include_private = false)
-        super || m.to_s[/count_(.+)_followers/] || m.to_s[/(.+)_followers/]
+        super || !!m.to_s[/count_(.+)_followers/] || !!m.to_s[/(.+)_followers/]
       end
 
       def blocked_followers_count
diff --git a/lib/acts_as_follower/follower.rb b/lib/acts_as_follower/follower.rb
index 8fa3300..93309ed 100644
--- a/lib/acts_as_follower/follower.rb
+++ b/lib/acts_as_follower/follower.rb
@@ -99,7 +99,7 @@ def method_missing(m, *args)
       end
 
       def respond_to?(m, include_private = false)
-        super || m.to_s[/following_(.+)_count/] || m.to_s[/following_(.+)/]
+        super || !!m.to_s[/following_(.+)_count/] || !!m.to_s[/following_(.+)/]
       end
 
       # Returns a follow record for the current instance and followable object.
diff --git a/lib/acts_as_follower/follower_lib.rb b/lib/acts_as_follower/follower_lib.rb
index fa40023..1d4a786 100644
--- a/lib/acts_as_follower/follower_lib.rb
+++ b/lib/acts_as_follower/follower_lib.rb
@@ -33,7 +33,7 @@ def apply_options_to_scope(scope, options = {})
     end
 
     def parent_classes
-      return DEFAULT_PARENTS unless ActsAsFollower.custom_parent_classes
+      return DEFAULT_PARENTS if ActsAsFollower.custom_parent_classes.blank?
 
       ActiveSupport::Deprecation.warn("Setting custom parent classes is deprecated and will be removed in future versions.")
       ActsAsFollower.custom_parent_classes + DEFAULT_PARENTS
diff --git a/test/acts_as_followable_test.rb b/test/acts_as_followable_test.rb
index 5f95412..8f675a0 100644
--- a/test/acts_as_followable_test.rb
+++ b/test/acts_as_followable_test.rb
@@ -275,7 +275,7 @@ class ActsAsFollowableTest < ActiveSupport::TestCase
       end
 
       should "return false when called with a nonexistent method" do
-        assert (not @oasis.respond_to?(:foobar))
+        assert (@oasis.respond_to?(:foobar) == false)
       end
     end
 
diff --git a/test/acts_as_follower_test.rb b/test/acts_as_follower_test.rb
index 0aece81..69289eb 100644
--- a/test/acts_as_follower_test.rb
+++ b/test/acts_as_follower_test.rb
@@ -184,7 +184,7 @@ class ActsAsFollowerTest < ActiveSupport::TestCase
       end
 
       should "return false when called with a nonexistent method" do
-        assert (not @sam.respond_to?(:foobar))
+        assert (@sam.respond_to?(:foobar) == false)
       end
     end