diff --git a/src/network/kernel/qauthenticator.cpp b/src/network/kernel/qauthenticator.cpp
index 107addae58..099d9586d2 100644
--- a/src/network/kernel/qauthenticator.cpp
+++ b/src/network/kernel/qauthenticator.cpp
@@ -1445,7 +1445,8 @@ static PSecurityFunctionTable pSecurityFunctionTable = NULL;
 
 static bool q_NTLM_SSPI_library_load()
 {
-    QMutexLocker locker(QMutexPool::globalInstanceGet((void *)&pSecurityFunctionTable));
+    static QBasicMutex mutex;
+    QMutexLocker l(&mutex);
 
     // Initialize security interface
     if (pSecurityFunctionTable == NULL) {