diff --git a/mutmut/__main__.py b/mutmut/__main__.py
index ea141399..68948369 100644
--- a/mutmut/__main__.py
+++ b/mutmut/__main__.py
@@ -73,6 +73,7 @@
 status_by_exit_code = {
     1: 'killed',
     3: 'killed',  # internal error in pytest means a kill
+    -24: 'killed',
     0: 'survived',
     5: 'no tests',
     2: 'check was interrupted by user',