diff --git a/composer.json b/composer.json
index 5227c0ff2d6e..a679e89c5e94 100644
--- a/composer.json
+++ b/composer.json
@@ -37,7 +37,7 @@
         "nette/utils": "^3.2",
         "nikic/php-parser": "^4.10.4",
         "phpstan/phpdoc-parser": "^0.4.9",
-        "phpstan/phpstan": "^0.12.79",
+        "phpstan/phpstan": "^0.12.80",
         "phpstan/phpstan-phpunit": "^0.12.17",
         "psr/simple-cache": "^1.0",
         "sebastian/diff": "^4.0.4",
diff --git a/rules/dead-code/src/ConditionEvaluator.php b/rules/dead-code/src/ConditionEvaluator.php
index c358074b7a65..3355fd067632 100644
--- a/rules/dead-code/src/ConditionEvaluator.php
+++ b/rules/dead-code/src/ConditionEvaluator.php
@@ -37,10 +37,17 @@ public function evaluate(ConditionInterface $condition)
     private function evaluateVersionCompareCondition(VersionCompareCondition $versionCompareCondition)
     {
         $compareSign = $versionCompareCondition->getCompareSign();
+        if ($compareSign !== null) {
+            return version_compare(
+                (string) $versionCompareCondition->getFirstVersion(),
+                (string) $versionCompareCondition->getSecondVersion(),
+                $compareSign
+            );
+        }
+
         return version_compare(
             (string) $versionCompareCondition->getFirstVersion(),
-            (string) $versionCompareCondition->getSecondVersion(),
-            $compareSign
+            (string) $versionCompareCondition->getSecondVersion()
         );
     }