Index: issue_nested_set.rb
===================================================================
--- issue_nested_set.rb	(revision 17354)
+++ issue_nested_set.rb	(working copy)
@@ -149,7 +149,7 @@
       end
 
       def lock_nested_set
-        if self.class.connection.adapter_name =~ /sqlserver/i
+        if self.class.connection.adapter_name.casecmp('sqlserver') == 0
           lock = "WITH (ROWLOCK HOLDLOCK UPDLOCK)"
           # Custom lock for SQLServer
           # This can be problematic if root_id or parent root_id changes
Index: project_nested_set.rb
===================================================================
--- project_nested_set.rb	(revision 17354)
+++ project_nested_set.rb	(working copy)
@@ -119,7 +119,7 @@
 
       def lock_nested_set
         lock = true
-        if self.class.connection.adapter_name =~ /sqlserver/i
+        if self.class.connection.adapter_name.casecmp('sqlserver') == 0
           lock = "WITH (ROWLOCK HOLDLOCK UPDLOCK)"
         end
         self.class.order(:id).lock(lock).ids