diff --git a/src/corelib/ipc/qtipccommon.cpp b/src/corelib/ipc/qtipccommon.cpp
index 06c6932f509..190cb8c1fdc 100644
--- a/src/corelib/ipc/qtipccommon.cpp
+++ b/src/corelib/ipc/qtipccommon.cpp
@@ -553,7 +553,7 @@ QNativeIpcKey QNativeIpcKey::fromString(const QString &text)
     Type invalidType = {};
     Type type = stringToType(u.scheme());
     if (type == invalidType || !u.isValid() || !u.userInfo().isEmpty() || !u.host().isEmpty()
-            || u.port() != -1)
+            || u.port() != -1 || u.hasQuery())
         return QNativeIpcKey(invalidType);
 
     QNativeIpcKey result(QString(), type);
@@ -562,6 +562,7 @@ QNativeIpcKey QNativeIpcKey::fromString(const QString &text)
 
     // decode the payload
     result.setNativeKey(u.path());
+
     return result;
 }
 
diff --git a/tests/auto/corelib/ipc/qnativeipckey/tst_qnativeipckey.cpp b/tests/auto/corelib/ipc/qnativeipckey/tst_qnativeipckey.cpp
index 7b08e642afd..35e5e1172b6 100644
--- a/tests/auto/corelib/ipc/qnativeipckey/tst_qnativeipckey.cpp
+++ b/tests/auto/corelib/ipc/qnativeipckey/tst_qnativeipckey.cpp
@@ -280,12 +280,14 @@ void tst_QNativeIpcKey::fromString_data()
             << "posix:%C4%80.%E2%80%80.%F0%90%80%80"
             << QNativeIpcKey(u"\u0100.\u2000.\U00010000"_s, QNativeIpcKey::Type::PosixRealtime);
 
-    // query and fragment are ignored
-    QTest::addRow("with-query") << "posix:/foo?bar" << valid;
+    // fragments are ignored
     QTest::addRow("with-fragment") << "posix:/foo#bar" << valid;
-    QTest::addRow("with-queryfragment") << "posix:/foo?bar#baz" << valid;
     QTest::addRow("with-fragmentquery") << "posix:/foo#bar?baz" << valid;
 
+    // but unknown query items are not
+    QTest::addRow("with-query") << "posix:/foo?bar" << invalid;
+    QTest::addRow("with-queryfragment") << "posix:/foo?bar#baz" << invalid;
+
     // add some ones that won't parse well
     QTest::addRow("positive-number") << "81" << invalid;
     QTest::addRow("negative-number") << "-81" << invalid;