diff --git a/src/Rules/Variables/DefinedVariableRule.php b/src/Rules/Variables/DefinedVariableRule.php
index 8fbb1e5d0b..f33e371fbe 100644
--- a/src/Rules/Variables/DefinedVariableRule.php
+++ b/src/Rules/Variables/DefinedVariableRule.php
@@ -41,6 +41,11 @@ public function getNodeType(): string
 	public function processNode(Node $node, Scope $scope): array
 	{
 		$errors = [];
+
+		if ($scope->isUndefinedExpressionAllowed($node)) {
+			return [];
+		}
+
 		if (is_string($node->name)) {
 			$variableNameScopes = [$node->name => $scope];
 		} else {
@@ -78,7 +83,7 @@ private function processSingleVariable(Scope $scope, Variable $node, string $var
 			}
 		}
 
-		if ($scope->isInExpressionAssign($node) || $scope->isUndefinedExpressionAllowed($node)) {
+		if ($scope->isInExpressionAssign($node)) {
 			return [];
 		}
 
diff --git a/tests/PHPStan/Rules/Variables/DefinedVariableRuleTest.php b/tests/PHPStan/Rules/Variables/DefinedVariableRuleTest.php
index 96b89cf070..c1b910789a 100644
--- a/tests/PHPStan/Rules/Variables/DefinedVariableRuleTest.php
+++ b/tests/PHPStan/Rules/Variables/DefinedVariableRuleTest.php
@@ -1169,4 +1169,19 @@ public function testBug8719(): void
 		$this->analyse([__DIR__ . '/data/bug-8719.php'], []);
 	}
 
+	public function testBug13353(): void
+	{
+		$this->cliArgumentsVariablesRegistered = true;
+		$this->polluteScopeWithLoopInitialAssignments = true;
+		$this->checkMaybeUndefinedVariables = true;
+		$this->polluteScopeWithAlwaysIterableForeach = true;
+
+		$this->analyse([__DIR__ . '/data/bug-13353.php'], [
+			[
+				'Variable $bar might not be defined.',
+				11,
+			],
+		]);
+	}
+
 }
diff --git a/tests/PHPStan/Rules/Variables/data/bug-13353.php b/tests/PHPStan/Rules/Variables/data/bug-13353.php
new file mode 100644
index 0000000000..ef13d0635f
--- /dev/null
+++ b/tests/PHPStan/Rules/Variables/data/bug-13353.php
@@ -0,0 +1,11 @@
+<?php declare(strict_types = 1);
+
+namespace Bug13353;
+
+$foo = 'bar';
+
+if (!isset($$foo)) {
+	echo 'Wololo';
+}
+
+echo $$foo;