diff --git a/tests/auto/corelib/serialization/qtextstream/test/CMakeLists.txt b/tests/auto/corelib/serialization/qtextstream/test/CMakeLists.txt
index 1db76f274f0..8da52ffb6b8 100644
--- a/tests/auto/corelib/serialization/qtextstream/test/CMakeLists.txt
+++ b/tests/auto/corelib/serialization/qtextstream/test/CMakeLists.txt
@@ -22,6 +22,10 @@ qt_internal_add_test(tst_qtextstream
     QT_TEST_SERVER_LIST "cyrus"
 )
 
+if(QT_FEATURE_sanitize_address)
+    set_property(TEST tst_qtextstream APPEND PROPERTY ENVIRONMENT "QTEST_FUNCTION_TIMEOUT=900000")
+endif()
+
 # Resources:
 set(qtextstream_resource_files
     "../resources/big_endian/"