diff --git a/tools/bisector/bisector/bisector.py b/tools/bisector/bisector/bisector.py
index de06331a44e6a8f058aa68c72a1562e6713b0e0f..6b61fc1b6244d9fddf69c92f09649a592b91c5ee 100755
--- a/tools/bisector/bisector/bisector.py
+++ b/tools/bisector/bisector/bisector.py
@@ -2308,7 +2308,7 @@ class ExekallLISATestStep(ShellStep):
                     'undecided': 'u',
                     'error': '#',
                 }
-                dist = str(
+                dist = ''.join(
                     issue_letter[issue]
                     for issue in iterations_summary
                 )