diff --git a/src/Analyser/MutatingScope.php b/src/Analyser/MutatingScope.php
index 1a4ab5fc4e..e3274f5b89 100644
--- a/src/Analyser/MutatingScope.php
+++ b/src/Analyser/MutatingScope.php
@@ -37,7 +37,7 @@
 use PHPStan\Node\Expr\PropertyInitializationExpr;
 use PHPStan\Node\Expr\SetOffsetValueTypeExpr;
 use PHPStan\Node\Expr\TypeExpr;
-use PHPStan\Node\NotIssetExpr;
+use PHPStan\Node\IssetExpr;
 use PHPStan\Node\Printer\ExprPrinter;
 use PHPStan\Parser\ArrayMapArgVisitor;
 use PHPStan\Parser\NewAssignedToPropertyVisitor;
@@ -3823,7 +3823,7 @@ public function filterBySpecifiedTypes(SpecifiedTypes $specifiedTypes): self
 			$expr = $typeSpecification['expr'];
 			$type = $typeSpecification['type'];
 
-			if ($expr instanceof NotIssetExpr) {
+			if ($expr instanceof IssetExpr) {
 				$unsetExpr = $expr->getExpr();
 				$scope = $scope->unsetExpression($unsetExpr);
 
diff --git a/src/Analyser/TypeSpecifier.php b/src/Analyser/TypeSpecifier.php
index a74f98df84..85f6e46c22 100644
--- a/src/Analyser/TypeSpecifier.php
+++ b/src/Analyser/TypeSpecifier.php
@@ -19,7 +19,7 @@
 use PhpParser\Node\Expr\StaticPropertyFetch;
 use PhpParser\Node\Name;
 use PHPStan\Node\Expr\AlwaysRememberedExpr;
-use PHPStan\Node\NotIssetExpr;
+use PHPStan\Node\IssetExpr;
 use PHPStan\Node\Printer\ExprPrinter;
 use PHPStan\Reflection\Assertions;
 use PHPStan\Reflection\ParametersAcceptor;
@@ -690,7 +690,7 @@ public function specifyTypesInCondition(
 
 						if ($isset === true && !TypeCombinator::containsNull($type)) {
 							$specifiedTypes = $specifiedTypes->unionWith($this->create(
-								new NotIssetExpr($var),
+								new IssetExpr($var),
 								new NullType(),
 								$context,
 								false,
@@ -757,7 +757,7 @@ public function specifyTypesInCondition(
 					$offsetType = $type->getOffsetValueType($dimType);
 					if ($hasOffsetType->yes() && !TypeCombinator::containsNull($offsetType)) {
 						$specifiedTypes = $specifiedTypes->unionWith($this->create(
-							new NotIssetExpr($var),
+							new IssetExpr($var),
 							new NullType(),
 							$context,
 							false,
diff --git a/src/Node/NotIssetExpr.php b/src/Node/IssetExpr.php
similarity index 80%
rename from src/Node/NotIssetExpr.php
rename to src/Node/IssetExpr.php
index ad73e2b70a..5c45df0ebc 100644
--- a/src/Node/NotIssetExpr.php
+++ b/src/Node/IssetExpr.php
@@ -4,7 +4,7 @@
 
 use PhpParser\Node\Expr;
 
-class NotIssetExpr extends Expr implements VirtualNode
+class IssetExpr extends Expr implements VirtualNode
 {
 
 	public function __construct(
@@ -21,7 +21,7 @@ public function getExpr(): Expr
 
 	public function getType(): string
 	{
-		return 'PHPStan_Node_NotIssetExpr';
+		return 'PHPStan_Node_IssetExpr';
 	}
 
 	/**
diff --git a/src/Node/Printer/Printer.php b/src/Node/Printer/Printer.php
index 853503df9d..4233c9b4e2 100644
--- a/src/Node/Printer/Printer.php
+++ b/src/Node/Printer/Printer.php
@@ -11,7 +11,7 @@
 use PHPStan\Node\Expr\PropertyInitializationExpr;
 use PHPStan\Node\Expr\SetOffsetValueTypeExpr;
 use PHPStan\Node\Expr\TypeExpr;
-use PHPStan\Node\NotIssetExpr;
+use PHPStan\Node\IssetExpr;
 use PHPStan\Type\VerbosityLevel;
 use function sprintf;
 
@@ -58,9 +58,9 @@ protected function pPHPStan_Node_PropertyInitializationExpr(PropertyInitializati
 		return sprintf('__phpstanPropertyInitialization(%s)', $expr->getPropertyName());
 	}
 
-	protected function pPHPStan_Node_NotIssetExpr(NotIssetExpr $expr): string // phpcs:ignore
+	protected function pPHPStan_Node_IssetExpr(IssetExpr $expr): string // phpcs:ignore
 	{
-		return sprintf('__phpstanNotIssetExpr(%s)', $this->p($expr->getExpr()));
+		return sprintf('__phpstanIssetExpr(%s)', $this->p($expr->getExpr()));
 	}
 
 }