diff --git a/lib/Doctrine/ORM/Mapping/AnsiQuoteStrategy.php b/lib/Doctrine/ORM/Mapping/AnsiQuoteStrategy.php
index 526c5ac51..d18c8be7c 100644
--- a/lib/Doctrine/ORM/Mapping/AnsiQuoteStrategy.php
+++ b/lib/Doctrine/ORM/Mapping/AnsiQuoteStrategy.php
@@ -91,6 +91,6 @@ class AnsiQuoteStrategy implements QuoteStrategy
      */
     public function getColumnAlias($columnName, $counter, AbstractPlatform $platform, ClassMetadata $class = null)
     {
-        return $platform->getSQLResultCasing($columnName . $counter);
+        return $platform->getSQLResultCasing($columnName . '_' . $counter);
     }
 }
diff --git a/lib/Doctrine/ORM/Mapping/DefaultQuoteStrategy.php b/lib/Doctrine/ORM/Mapping/DefaultQuoteStrategy.php
index 5adfa8b16..eb2d22332 100644
--- a/lib/Doctrine/ORM/Mapping/DefaultQuoteStrategy.php
+++ b/lib/Doctrine/ORM/Mapping/DefaultQuoteStrategy.php
@@ -131,7 +131,7 @@ class DefaultQuoteStrategy implements QuoteStrategy
         //     If the alias is to long, characters are cut off from the beginning.
         // 3 ) Strip non alphanumeric characters
         // 4 ) Prefix with "_" if the result its numeric
-        $columnName = $columnName . $counter;
+        $columnName = $columnName . '_' . $counter;
         $columnName = substr($columnName, -$platform->getMaxIdentifierLength());
         $columnName = preg_replace('/[^A-Za-z0-9_]/', '', $columnName);
         $columnName = is_numeric($columnName) ? '_' . $columnName : $columnName;