diff --git a/modules/dblog/dblog.install b/modules/dblog/dblog.install
index bb56903a9d6..0316d34f801 100644
--- a/modules/dblog/dblog.install
+++ b/modules/dblog/dblog.install
@@ -92,6 +92,13 @@ function dblog_schema() {
   return $schema;
 }
 
+/**
+ * Implements hook_uninstall().
+ */
+function dblog_uninstall() {
+  variable_del('dblog_row_limit');
+}
+
 /**
  * @addtogroup updates-6.x-to-7.x
  * @{