diff --git a/src/corelib/plugin/qlibrary_win.cpp b/src/corelib/plugin/qlibrary_win.cpp
index a4d3f67c27..9368e53b3f 100644
--- a/src/corelib/plugin/qlibrary_win.cpp
+++ b/src/corelib/plugin/qlibrary_win.cpp
@@ -116,7 +116,7 @@ bool QLibraryPrivate::load_sys()
 #endif
     if (!pHnd) {
         errorString = QLibrary::tr("Cannot load library %1: %2").arg(
-                    QDir::toNativeSeparators(fileName)).arg(qt_error_string());
+                    QDir::toNativeSeparators(fileName), qt_error_string());
     } else {
         // Query the actual name of the library that was loaded
         errorString.clear();
@@ -152,7 +152,7 @@ bool QLibraryPrivate::unload_sys()
 {
     if (!FreeLibrary(pHnd)) {
         errorString = QLibrary::tr("Cannot unload library %1: %2").arg(
-                    QDir::toNativeSeparators(fileName)).arg(qt_error_string());
+                    QDir::toNativeSeparators(fileName),  qt_error_string());
         return false;
     }
     errorString.clear();
@@ -164,8 +164,7 @@ QFunctionPointer QLibraryPrivate::resolve_sys(const char* symbol)
     FARPROC address = GetProcAddress(pHnd, symbol);
     if (!address) {
         errorString = QLibrary::tr("Cannot resolve symbol \"%1\" in %2: %3").arg(
-            QString::fromLatin1(symbol)).arg(
-                    QDir::toNativeSeparators(fileName)).arg(qt_error_string());
+            QString::fromLatin1(symbol), QDir::toNativeSeparators(fileName), qt_error_string());
     } else {
         errorString.clear();
     }
diff --git a/src/network/socket/qlocalserver_win.cpp b/src/network/socket/qlocalserver_win.cpp
index 8cb3449343..ced923ced1 100644
--- a/src/network/socket/qlocalserver_win.cpp
+++ b/src/network/socket/qlocalserver_win.cpp
@@ -225,7 +225,7 @@ bool QLocalServerPrivate::addListener()
 void QLocalServerPrivate::setError(const QString &function)
 {
     int windowsError = GetLastError();
-    errorString = QString::fromLatin1("%1: %2").arg(function).arg(qt_error_string(windowsError));
+    errorString = QString::fromLatin1("%1: %2").arg(function, qt_error_string(windowsError));
     error = QAbstractSocket::UnknownSocketError;
 }