diff --git a/lib/tasks/redmine.rake b/lib/tasks/redmine.rake
index cd11796e3..c8d35afb2 100644
--- a/lib/tasks/redmine.rake
+++ b/lib/tasks/redmine.rake
@@ -60,9 +60,18 @@ WARNING: All data in the development database is deleted.
 DESC
 
   task :migrate_dbms => :environment do
-    ActiveRecord::Base.establish_connection :production
+    ActiveRecord::Base.establish_connection :development
+    target_tables = ActiveRecord::Base.connection.tables
+    ActiveRecord::Base.remove_connection
 
-    (ActiveRecord::Base.connection.tables - %w(schema_migrations plugin_schema_info)).each do |table_name|
+    ActiveRecord::Base.establish_connection :production
+    tables = ActiveRecord::Base.connection.tables.sort - %w(schema_migrations plugin_schema_info)
+
+    if (tables - target_tables).any?
+      abort "The following table(s) are missing from the target database: #{(tables - target_tables).join(', ')}"
+    end
+
+    tables.each do |table_name|
       Source = Class.new(ActiveRecord::Base)
       Target = Class.new(ActiveRecord::Base)
       Target.establish_connection(:development)