diff --git a/config/mutant.yml b/config/mutant.yml
index 8bacdd53..b39615e5 100644
--- a/config/mutant.yml
+++ b/config/mutant.yml
@@ -1,6 +1,8 @@
 name: mutant
 namespace: Mutant
 zombify: true
-ignore_subject:
+ignore_subjects:
 # Mutation causes infinite runtime
 - Mutant::Runner.lookup
+- Mutant::Zombifier*
+- Mutant::Reporter*