diff --git a/src/ameba/runner.cr b/src/ameba/runner.cr
index d2189b394..ebca6278c 100644
--- a/src/ameba/runner.cr
+++ b/src/ameba/runner.cr
@@ -162,7 +162,12 @@ module Ameba
     ensure
       missing_location = Crystal::Location.new(nil, 0, 0)
       source.issues.sort_by! do |issue|
-        issue.location || missing_location
+        location = issue.location || missing_location
+        {
+          location.filename.to_s,
+          location.line_number,
+          location.column_number,
+        }
       end
       @formatter.source_finished source
     end