diff --git a/phpstan-baseline.neon b/phpstan-baseline.neon
index a281f902bb..825b1996c5 100644
--- a/phpstan-baseline.neon
+++ b/phpstan-baseline.neon
@@ -14184,12 +14184,6 @@ parameters:
 			count: 1
 			path: src/Util.php
 
-		-
-			message: '#^Offset int\<1, 6\> on array\{string, string, string, string, string, string, string\} in isset\(\) always exists and is not nullable\.$#'
-			identifier: isset.offset
-			count: 1
-			path: src/Util.php
-
 		-
 			message: '#^Only booleans are allowed in a negated boolean, int\<0, 2\> given\.$#'
 			identifier: booleanNot.exprNotBoolean
diff --git a/src/Util.php b/src/Util.php
index e577cc621a..2d3f66e9dd 100644
--- a/src/Util.php
+++ b/src/Util.php
@@ -330,7 +330,7 @@ class Util
         /** @infection-ignore-all */
         for ($d = 6, $ex = 15; $d >= 1; $d--, $ex -= 3) {
             $unitSize = $li * 10 ** $ex;
-            if (isset($byteUnits[$d]) && $value >= $unitSize) {
+            if ($value >= $unitSize) {
                 // use 1024.0 to avoid integer overflow on 64-bit machines
                 $value = round($value / (1024 ** $d / $dh)) / $dh;
                 $unit = $byteUnits[$d];