diff --git a/Makefile b/Makefile
index 6227c14..e9f5abf 100644
--- a/Makefile
+++ b/Makefile
@@ -42,7 +42,7 @@ COMPOSER=$(PHP) $(shell which composer)
 # Infection
 INFECTION=vendor/bin/infection
 MIN_MSI=96
-MIN_COVERED_MSI=100
+MIN_COVERED_MSI=99
 INFECTION_ARGS=--min-msi=$(MIN_MSI) --min-covered-msi=$(MIN_COVERED_MSI) --threads=$(JOBS) --coverage=build/logs --log-verbosity=default --show-mutations
 INFECTION_PHP_VERSION="PHP 7.2"