diff --git a/db/migrate/20150724165259_add_index_to_post_custom_fields.rb b/db/migrate/20150724165259_add_index_to_post_custom_fields.rb
index b0197d311..230b3d499 100644
--- a/db/migrate/20150724165259_add_index_to_post_custom_fields.rb
+++ b/db/migrate/20150724165259_add_index_to_post_custom_fields.rb
@@ -1,5 +1,14 @@
 class AddIndexToPostCustomFields < ActiveRecord::Migration
-  def change
-    add_index :post_custom_fields, [:name, :value]
+  def up
+    execute <<SQL
+      CREATE INDEX index_post_custom_fields_on_name_and_value ON post_custom_fields USING btree (name, left(value, 200))
+SQL
+  end
+
+  def down
+    execute <<SQL
+      DROP INDEX index_post_custom_fields_on_name_and_value
+SQL
+
   end
 end
diff --git a/db/migrate/20150728004647_correct_custom_fields_migration.rb b/db/migrate/20150728004647_correct_custom_fields_migration.rb
new file mode 100644
index 000000000..1e72dd53e
--- /dev/null
+++ b/db/migrate/20150728004647_correct_custom_fields_migration.rb
@@ -0,0 +1,15 @@
+class CorrectCustomFieldsMigration < ActiveRecord::Migration
+  def up
+    execute <<SQL
+      DROP INDEX index_post_custom_fields_on_name_and_value
+SQL
+
+    execute <<SQL
+      CREATE INDEX index_post_custom_fields_on_name_and_value ON post_custom_fields USING btree (name, left(value, 200))
+SQL
+  end
+
+  def down
+    # nothing, no point rolling this back, we rewrote history
+  end
+end