diff --git a/app/logical/post_query_builder.rb b/app/logical/post_query_builder.rb
index b66769884..b3685ca9b 100644
--- a/app/logical/post_query_builder.rb
+++ b/app/logical/post_query_builder.rb
@@ -161,7 +161,7 @@ class PostQueryBuilder
         relation = relation.where("SourcePattern(posts.source) LIKE ? ESCAPE E'\\\\'", "pixiv/" + $1)
         has_constraints!
       else
-        relation = relation.where("SourcePattern(posts.source) LIKE SourcePattern(?) ESCAPE E'\\\\'", q[:source])
+        relation = relation.where("posts.source LIKE ? ESCAPE E'\\\\'", q[:source])
         has_constraints!
       end
     end