diff --git a/src/Relationship/RegularRelationship.php b/src/Relationship/RegularRelationship.php
index b5e715b..0e033f2 100644
--- a/src/Relationship/RegularRelationship.php
+++ b/src/Relationship/RegularRelationship.php
@@ -112,8 +112,10 @@ public function joinSelect(
         callable $sub = null
     ) : void
     {
-        $foreignTable = $this->foreignTableName;
-        $spec = "{$foreignTable} AS {$foreignAlias}";
+        $spec = $this->foreignTableName;
+        if ($spec !== $foreignAlias) {
+            $spec .= " AS {$foreignAlias}";
+        }
 
         $cond = [];
         foreach ($this->on as $nativeCol => $foreignCol) {
diff --git a/tests/MapperSelectTest.php b/tests/MapperSelectTest.php
index a0f3364..4b39815 100644
--- a/tests/MapperSelectTest.php
+++ b/tests/MapperSelectTest.php
@@ -93,7 +93,7 @@ public function testJoinWithSubRelated()
                 *
             FROM
                 authors
-                    LEFT JOIN threads AS threads ON authors.author_id = threads.author_id
+                    LEFT JOIN threads ON authors.author_id = threads.author_id
                     INNER JOIN taggings AS taggings_alias ON threads.thread_id = taggings_alias.thread_id
                     JOIN tags AS tag ON taggings_alias.tag_id = tag.tag_id
         ';
diff --git a/tests/MapperTest.php b/tests/MapperTest.php
index 6c7dcd6..2a67c2e 100644
--- a/tests/MapperTest.php
+++ b/tests/MapperTest.php
@@ -398,7 +398,7 @@ public function testLeftJoinWith()
 
 FROM
     threads
-LEFT JOIN replies AS replies ON threads.thread_id = replies.thread_id
+LEFT JOIN replies ON threads.thread_id = replies.thread_id
 ORDER BY
     replies.reply_id DESC';
 
@@ -418,7 +418,7 @@ public function testInnerJoinWith()
 
 FROM
     threads
-INNER JOIN replies AS replies ON threads.thread_id = replies.thread_id
+INNER JOIN replies ON threads.thread_id = replies.thread_id
 ORDER BY
     replies.reply_id DESC';