diff --git a/modules/comment/comment.install b/modules/comment/comment.install
index d64b3ac..120467f 100644
--- a/modules/comment/comment.install
+++ b/modules/comment/comment.install
@@ -16,6 +16,7 @@ function comment_uninstall() {
   variable_del('comment_block_count');
   $node_types = array_keys(node_type_get_types());
   foreach ($node_types as $node_type) {
+    field_attach_delete_bundle('comment', 'comment_node_' . $node_type);
     variable_del('comment_' . $node_type);
     variable_del('comment_anonymous_' . $node_type);
     variable_del('comment_controls_' . $node_type);
diff --git a/modules/taxonomy/taxonomy.install b/modules/taxonomy/taxonomy.install
index f28ffed..56b7e01 100644
--- a/modules/taxonomy/taxonomy.install
+++ b/modules/taxonomy/taxonomy.install
@@ -12,6 +12,11 @@ function taxonomy_uninstall() {
   // Remove variables.
   variable_del('taxonomy_override_selector');
   variable_del('taxonomy_terms_per_page_admin');
+  // Remove taxonomy_term bundles.
+  $vocabularies = db_query("SELECT machine_name FROM {taxonomy_vocabulary}")->fetchCol();
+  foreach ($vocabularies as $vocabulary) {
+    field_attach_delete_bundle('taxonomy_term', $vocabulary);
+  }
 }
 
 /**