diff --git a/tests/Platform/QueryResultTypeWalkerFetchTypeMatrixTest.php b/tests/Platform/QueryResultTypeWalkerFetchTypeMatrixTest.php
index 28a127c3..c9f07109 100644
--- a/tests/Platform/QueryResultTypeWalkerFetchTypeMatrixTest.php
+++ b/tests/Platform/QueryResultTypeWalkerFetchTypeMatrixTest.php
@@ -4714,7 +4714,7 @@ private function assertInferredResultMatchesExpected(
 		$realFirstResult = var_export($firstResult, true);
 
 		self::assertTrue($inferredType->isConstantArray()->yes());
-		$inferredFirstItemType = $inferredType->getFirstIterableValueType();
+		$inferredFirstItemType = $inferredType->getIterableValueType();
 
 		self::assertTrue(
 			$expectedFirstItemType->accepts($inferredFirstItemType, true)->yes(),