diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8d8f40227..afedbbcc7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,13 @@ This project uses [*towncrier*](https://towncrier.readthedocs.io/) and the chang
 
 <!-- towncrier release notes start -->
 
+## [1.20.1] - 2024-07-26
+
+### Fixed
+
+- `INCIDENT_LEVEL_CHOICES` was behaving oddly when debugging so it has been
+  made a proper immutable constant.
+
 ## [1.20.0] - 2024-07-25
 
 
diff --git a/src/argus/incident/constants.py b/src/argus/incident/constants.py
index e8d3f3238..c9ca7069d 100644
--- a/src/argus/incident/constants.py
+++ b/src/argus/incident/constants.py
@@ -4,4 +4,4 @@
 MIN_INCIDENT_LEVEL = 1  # Do not override
 MAX_INCIDENT_LEVEL = 5
 INCIDENT_LEVELS = tuple(range(MIN_INCIDENT_LEVEL, MAX_INCIDENT_LEVEL + 1))
-INCIDENT_LEVEL_CHOICES = zip(INCIDENT_LEVELS, map(str, INCIDENT_LEVELS))
+INCIDENT_LEVEL_CHOICES = tuple(zip(INCIDENT_LEVELS, map(str, INCIDENT_LEVELS)))