diff --git a/src/corelib/ipc/qsharedmemory_systemv.cpp b/src/corelib/ipc/qsharedmemory_systemv.cpp
index ddf9a36cd67..dc9de11091d 100644
--- a/src/corelib/ipc/qsharedmemory_systemv.cpp
+++ b/src/corelib/ipc/qsharedmemory_systemv.cpp
@@ -160,6 +160,8 @@ bool QSharedMemorySystemV::attach(QSharedMemoryPrivate *self, QSharedMemory::Acc
     int id = shmget(unix_key, 0, (mode == QSharedMemory::ReadOnly ? 0400 : 0600));
     if (-1 == id) {
         self->setUnixErrorString("QSharedMemory::attach (shmget)"_L1);
+        unix_key = 0;
+        nativeKeyFile.clear();
         return false;
     }
 
diff --git a/tests/auto/corelib/ipc/qsharedmemory/tst_qsharedmemory.cpp b/tests/auto/corelib/ipc/qsharedmemory/tst_qsharedmemory.cpp
index 8e7d0064ce7..faa56482b34 100644
--- a/tests/auto/corelib/ipc/qsharedmemory/tst_qsharedmemory.cpp
+++ b/tests/auto/corelib/ipc/qsharedmemory/tst_qsharedmemory.cpp
@@ -575,9 +575,6 @@ void tst_QSharedMemory::attachBeforeCreate()
     const qsizetype sz = 100;
     QSharedMemory mem(key);
     QVERIFY(!mem.attach());
-    // Fails for all SystemV backends now
-    if (!legacy && (keyType < QNativeIpcKey::Type::PosixRealtime))
-        QEXPECT_FAIL("", "Not fixed yet", Continue);
     QVERIFY(mem.create(sz));
 }