diff --git a/lib/ancestry/has_ancestry.rb b/lib/ancestry/has_ancestry.rb
index 34074a01..f54a7043 100644
--- a/lib/ancestry/has_ancestry.rb
+++ b/lib/ancestry/has_ancestry.rb
@@ -51,8 +51,8 @@ def has_ancestry options = {}
     send scope_method, :descendants_of, lambda { |object| {:conditions => to_node(object).descendant_conditions} }
     send scope_method, :subtree_of, lambda { |object| {:conditions => to_node(object).subtree_conditions} }
     send scope_method, :siblings_of, lambda { |object| {:conditions => to_node(object).sibling_conditions} }
-    send scope_method, :ordered_by_ancestry, :order => "(case when #{ancestry_column} is null then 0 else 1 end), #{ancestry_column}"
-    send scope_method, :ordered_by_ancestry_and, lambda { |order| {:order => "(case when #{ancestry_column} is null then 0 else 1 end), #{ancestry_column}, #{order}"} }
+    send scope_method, :ordered_by_ancestry, :order => "(case when #{table_name}.#{ancestry_column} is null then 0 else 1 end), #{table_name}.#{ancestry_column}"
+    send scope_method, :ordered_by_ancestry_and, lambda { |order| {:order => "(case when #{table_name}.#{ancestry_column} is null then 0 else 1 end), #{table_name}.#{ancestry_column}, #{order}"} }
     
     # Update descendants with new ancestry before save
     before_save :update_descendants_with_new_ancestry
@@ -86,4 +86,4 @@ def has_ancestry options = {}
   if !respond_to?(:acts_as_tree)
     alias_method :acts_as_tree, :has_ancestry
   end
-end
\ No newline at end of file
+end
diff --git a/lib/ancestry/instance_methods.rb b/lib/ancestry/instance_methods.rb
index 6e6bbcda..99ba623e 100644
--- a/lib/ancestry/instance_methods.rb
+++ b/lib/ancestry/instance_methods.rb
@@ -171,7 +171,7 @@ def is_only_child?
 
     # Descendants
     def descendant_conditions
-      ["#{self.base_class.ancestry_column} like ? or #{self.base_class.ancestry_column} = ?", "#{child_ancestry}/%", child_ancestry]
+      ["#{self.base_class.table_name}.#{self.base_class.ancestry_column} like ? or #{self.base_class.table_name}.#{self.base_class.ancestry_column} = ?", "#{child_ancestry}/%", child_ancestry]
     end
 
     def descendants depth_options = {}
@@ -184,7 +184,7 @@ def descendant_ids depth_options = {}
 
     # Subtree
     def subtree_conditions
-      ["#{self.base_class.primary_key} = ? or #{self.base_class.ancestry_column} like ? or #{self.base_class.ancestry_column} = ?", self.id, "#{child_ancestry}/%", child_ancestry]
+      ["#{self.base_class.table_name}.#{self.base_class.primary_key} = ? or #{self.base_class.table_name}.#{self.base_class.ancestry_column} like ? or #{self.base_class.table_name}.#{self.base_class.ancestry_column} = ?", self.id, "#{child_ancestry}/%", child_ancestry]
     end
 
     def subtree depth_options = {}
@@ -229,4 +229,4 @@ def primary_key_type
       @primary_key_type ||= column_for_attribute(self.class.primary_key).type
     end
   end
-end
\ No newline at end of file
+end