diff --git a/src/Rules/Comparison/ImpossibleCheckTypeHelper.php b/src/Rules/Comparison/ImpossibleCheckTypeHelper.php
index 7d6585ebaf..b353e7f60d 100644
--- a/src/Rules/Comparison/ImpossibleCheckTypeHelper.php
+++ b/src/Rules/Comparison/ImpossibleCheckTypeHelper.php
@@ -154,7 +154,7 @@ public function findSpecifiedType(
 							foreach ($haystackArrayTypes as $haystackArrayType) {
 								if ($haystackArrayType instanceof ConstantArrayType) {
 									foreach ($haystackArrayType->getValueTypes() as $i => $haystackArrayValueType) {
-										if (count($haystackArrayValueType->getFiniteTypes()) > 1 || $haystackArrayType->isOptionalKey($i)) {
+										if ($haystackArrayType->isOptionalKey($i)) {
 											continue;
 										}
 
@@ -163,7 +163,7 @@ public function findSpecifiedType(
 											continue;
 										}
 
-										foreach ($haystackArrayValueType->getConstantScalarTypes() as $constantScalarType) {
+										foreach ($haystackArrayValueConstantScalarTypes as $constantScalarType) {
 											if ($constantScalarType->isSuperTypeOf($needleType)->yes()) {
 												continue 3;
 											}