diff --git a/src/Storages/transformQueryForExternalDatabaseAnalyzer.cpp b/src/Storages/transformQueryForExternalDatabaseAnalyzer.cpp
index dc1749b3196..ff40b1fcc2d 100644
--- a/src/Storages/transformQueryForExternalDatabaseAnalyzer.cpp
+++ b/src/Storages/transformQueryForExternalDatabaseAnalyzer.cpp
@@ -71,8 +71,7 @@ ASTPtr getASTForExternalDatabaseFromQueryTree(const QueryTreeNodePtr & query_tre
     {
         if (join_node->getStrictness() != JoinStrictness::All)
             allow_where = false;
-
-        if (join_node->getKind() == JoinKind::Left)
+        else if (join_node->getKind() == JoinKind::Left)
             allow_where = join_node->getLeftTableExpression()->isEqual(*table_expression);
         else if (join_node->getKind() == JoinKind::Right)
             allow_where = join_node->getRightTableExpression()->isEqual(*table_expression);