1 files changed, 1 insertions, 1 deletions
diff --git a/tests/auto/blackbox/testdata/undefined-target-platform/undefined-target-platform.qbs b/tests/auto/blackbox/testdata/undefined-target-platform/undefined-target-platform.qbs
index 2b3724c26..4a738afcc 100644
--- a/tests/auto/blackbox/testdata/undefined-target-platform/undefined-target-platform.qbs
+++ b/tests/auto/blackbox/testdata/undefined-target-platform/undefined-target-platform.qbs
@@ -6,7 +6,7 @@ Product {
     qbs.targetPlatform: undefined
 
     readonly property bool _validate: {
-        if (Array.isArray(qbs.targetOS) && qbs.targetOS.length === 0)
+        if ((qbs.targetOS instanceof Array) && qbs.targetOS.length === 0)
             return true;
         throw "Invalid qbs.targetOS value: " + qbs.targetOS;
     }