diff --git a/votingapi.install b/votingapi.install
index 9e0ecf4..032f6e7 100644
--- a/votingapi.install
+++ b/votingapi.install
@@ -50,6 +50,21 @@ function votingapi_schema() {
 }
 
 /**
+ * Implements hook_uninstall().
+ */
+function votingapi_uninstall() {
+  // Delete variables created by voteapi module.
+  $variables = array(
+    'votingapi_last_cron',
+    'votingapi_anonymous_window',
+    'votingapi_calculation_schedule',
+  );
+  foreach ($variables as $variable) {
+    variable_del($variable);
+  }
+}
+
+/**
  * The most recent update removed for version-to-version compatibility.
  */
 function votingapi_update_last_removed() {
@@ -69,4 +84,4 @@ function votingapi_update_7201() {
   db_change_field('votingapi_cache', 'content_id', 'entity_id', array('type' => 'int', 'unsigned' => TRUE, 'not null' => TRUE, 'default' => 0));
 
   return t('Updated VotingAPI table structure.');
-}
\ No newline at end of file
+}