diff --git a/ChangeLog b/ChangeLog
index c91279eb6e..554e407928 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -44,6 +44,7 @@ phpMyAdmin - ChangeLog
 - bug #4520 sql.js: cannot read property
 - bug #4521 Initially allowed chart types do not match selected data
 - bug #4518 Export to SQL: CREATE TABLE option AUTO_INCREMENT ignored
+- bug #4522 Duplicate column names while assigning index
 
 4.2.7.1 (2014-08-17)
 - bug #4501 [security] XSS in table browse page
diff --git a/libraries/Table.class.php b/libraries/Table.class.php
index f53028ac0d..c057c8256f 100644
--- a/libraries/Table.class.php
+++ b/libraries/Table.class.php
@@ -1418,8 +1418,20 @@ class PMA_Table
             if (count($index) > 1) {
                 continue;
             }
-            $return[] = ($fullName ? $this->getFullName($backquoted) . '.' : '')
-                . ($backquoted ? PMA_Util::backquote($index[0]) : $index[0]);
+            if ($fullName) {
+                $possible_column = $this->getFullName($backquoted) . '.';
+            } else {
+                $possible_column = '';
+            }
+            if ($backquoted) {
+                $possible_column .= PMA_Util::backquote($index[0]);
+            } else {
+                $possible_column .= $index[0];
+            }
+            // a column might have a primary and an unique index on it
+            if (! in_array($possible_column, $return)) {
+                $return[] = $possible_column;
+            }
         }
 
         return $return;