diff --git a/Makefile b/Makefile
index 2ea9847..54c38ee 100644
--- a/Makefile
+++ b/Makefile
@@ -14,7 +14,7 @@ test-unit: ## Run unit tests with coverage
 	go test ./... -cover -v
 
 test-mutation: ## Run mutation tests with gremlins
-	gremlins unleash
+	gremlins unleash --threshold 1.0
 
 FUZZ_TIME ?= 30