diff --git a/taxonomy_manager.admin.inc b/taxonomy_manager.admin.inc
index d768cc9..af315a5 100644
--- a/taxonomy_manager.admin.inc
+++ b/taxonomy_manager.admin.inc
@@ -610,13 +610,30 @@ function taxonomy_manager_term_merge_form(&$form, $voc) {
     '#autocomplete_path' => 'taxonomy_manager/autocomplete/' . $voc->vid,
   );
 
-  $form['term_merge']['options'] = array(
-    '#type' => 'checkboxes',
-    '#title' => t('Options'),
-    '#options' => array(
-      'keep_merged' => t('Keep merged terms'),
-    ),
-  );
+  // Due to an error in naming convensions in Term Merge repository there was a
+  // 7.x-2.0-beta2 release, which in fact was from early 7.x-1.x version and as
+  // time was going by that release has falled far behind the actual 7.x-1.x
+  // branch, however, still there are a lot of folks, that use that old release
+  // of the module. This is the reason we check module's version here.
+  // TODO: remove this version checking once 7.x-2.0-beta2 becomes less popular.
+  // See https://drupal.org/node/2075133 for more details.
+  $term_merge = system_get_info('module', 'term_merge');
+  if ($term_merge['version'] != '7.x-2.0-beta2') {
+    // We delegate the generation of merge options to Term Merge module, since
+    // the latter has a specially designed function for those purposes.
+    $form['term_merge']['options'] = term_merge_merge_options_elements($voc);
+  }
+  else {
+    // In 7.x-2.0-beta2 the special function for merge options does not exist,
+    // so we just generate it here.
+    $form['term_merge']['options'] = array(
+      '#type' => 'checkboxes',
+      '#title' => t('Options'),
+      '#options' => array(
+        'keep_merged' => t('Keep merged terms'),
+      ),
+    );
+  }
 
   $form['term_merge']['submit'] = array(
     '#type' => 'submit',
@@ -1605,7 +1622,24 @@ function taxonomy_manager_form_term_merge_submit($form, $form_state) {
   }
   $term_names = implode($term_names_array, ', ');
   if (module_exists('term_merge')) {
-    term_merge($selected_tids, $dest_term->tid, $form_state['values']['term_merge']['options']['keep_merged']);
+    // Due to an error in naming convensions in Term Merge repository there was
+    // a 7.x-2.0-beta2 release, which in fact was from early 7.x-1.x version and
+    // as time was going by that release has falled far behind the actual
+    // 7.x-1.x branch, however, still there are a lot of folks, that use that
+    // old release of the module. This is the reason we check module's version
+    // here.
+    // TODO: remove this version checking once 7.x-2.0-beta2 becomes less popular.
+    // See https://drupal.org/node/2075133 for more details.
+    $term_merge = system_get_info('module', 'term_merge');
+    if ($term_merge['version'] != '7.x-2.0-beta2') {
+      // Using a new signature of term_merge() function.
+      $merge_settings = term_merge_merge_options_submit($form['term_merge']['options'], $form_state, $form);
+      term_merge($selected_tids, $dest_term->tid, $merge_settings);
+    }
+    else {
+      // Using old signature of term_merge() function.
+      term_merge($selected_tids, $dest_term->tid, $form_state['values']['term_merge']['options']['keep_merged']);
+    }
     drupal_set_message(t("Terms %term_names merged into %dest_term", array('%term_names' => $term_names, '%dest_term' => $dest_term->name)));
   }
   else {