diff --git a/src/corelib/tools/qlocale.cpp b/src/corelib/tools/qlocale.cpp
index a253057435..a923be50c0 100644
--- a/src/corelib/tools/qlocale.cpp
+++ b/src/corelib/tools/qlocale.cpp
@@ -3144,7 +3144,7 @@ bool QLocaleData::numberToCLocale(const QChar *str, int len,
 }
 
 bool QLocaleData::validateChars(const QString &str, NumberMode numMode, QByteArray *buff,
-                                    int decDigits) const
+                                int decDigits, bool rejectGroupSeparators) const
 {
     buff->clear();
     buff->reserve(str.length());
@@ -3205,7 +3205,7 @@ bool QLocaleData::validateChars(const QString &str, NumberMode numMode, QByteArr
 
                 case ',':
                     //it can only be placed after a digit which is before the decimal point
-                    if (!lastWasDigit || decPointCnt > 0)
+                    if (rejectGroupSeparators || !lastWasDigit || decPointCnt > 0)
                         return false;
                     break;
 
diff --git a/src/corelib/tools/qlocale_p.h b/src/corelib/tools/qlocale_p.h
index c33ced35d5..c5e62027c4 100644
--- a/src/corelib/tools/qlocale_p.h
+++ b/src/corelib/tools/qlocale_p.h
@@ -251,7 +251,9 @@ public:
     inline char digitToCLocale(QChar c) const;
 
     // this function is used in QIntValidator (QtGui)
-    Q_CORE_EXPORT bool validateChars(const QString &str, NumberMode numMode, QByteArray *buff, int decDigits = -1) const;
+    Q_CORE_EXPORT bool validateChars(const QString &str, NumberMode numMode,
+                                     QByteArray *buff, int decDigits = -1,
+                                     bool rejectGroupSeparators = false) const;
 
 public:
     quint16 m_language_id, m_script_id, m_country_id;
diff --git a/src/gui/util/qvalidator.cpp b/src/gui/util/qvalidator.cpp
index aac9282710..f879847935 100644
--- a/src/gui/util/qvalidator.cpp
+++ b/src/gui/util/qvalidator.cpp
@@ -398,7 +398,8 @@ static qlonglong pow10(int exp)
 QValidator::State QIntValidator::validate(QString & input, int&) const
 {
     QByteArray buff;
-    if (!locale().d->m_data->validateChars(input, QLocaleData::IntegerMode, &buff)) {
+    if (!locale().d->m_data->validateChars(input, QLocaleData::IntegerMode, &buff,
+                                           -1, locale().numberOptions() & QLocale::RejectGroupSeparator)) {
         return Invalid;
     }
 
@@ -437,7 +438,8 @@ QValidator::State QIntValidator::validate(QString & input, int&) const
 void QIntValidator::fixup(QString &input) const
 {
     QByteArray buff;
-    if (!locale().d->m_data->validateChars(input, QLocaleData::IntegerMode, &buff)) {
+    if (!locale().d->m_data->validateChars(input, QLocaleData::IntegerMode, &buff,
+                                           -1, locale().numberOptions() & QLocale::RejectGroupSeparator)) {
         return;
     }
     bool ok, overflow;
@@ -658,8 +660,10 @@ QValidator::State QDoubleValidatorPrivate::validateWithLocale(QString &input, QL
 {
     Q_Q(const QDoubleValidator);
     QByteArray buff;
-    if (!locale.d->m_data->validateChars(input, numMode, &buff, q->dec))
+    if (!locale.d->m_data->validateChars(input, numMode, &buff, q->dec,
+                                         locale.numberOptions() & QLocale::RejectGroupSeparator)) {
         return QValidator::Invalid;
+    }
 
     if (buff.isEmpty())
         return QValidator::Intermediate;
diff --git a/tests/auto/gui/util/qdoublevalidator/tst_qdoublevalidator.cpp b/tests/auto/gui/util/qdoublevalidator/tst_qdoublevalidator.cpp
index e08af2491d..a63183e5fc 100644
--- a/tests/auto/gui/util/qdoublevalidator/tst_qdoublevalidator.cpp
+++ b/tests/auto/gui/util/qdoublevalidator/tst_qdoublevalidator.cpp
@@ -59,30 +59,39 @@ void tst_QDoubleValidator::validateThouSep_data()
 {
     QTest::addColumn<QString>("localeName");
     QTest::addColumn<QString>("value");
+    QTest::addColumn<bool>("rejectGroupSeparator");
     QTest::addColumn<QValidator::State>("result");
 
-    QTest::newRow("1,000C") << "C" << QString("1,000") << ACC;
-    QTest::newRow("1.000C") << "C" << QString("1.000") << ACC;
+    QTest::newRow("1,000C") << "C" << QString("1,000") << false << ACC;
+    QTest::newRow("1,000.1C") << "C" << QString("1,000.1") << false << ACC;
+    QTest::newRow("1,000.1C_reject") << "C" << QString("1,000.1") << true << INV;
+    QTest::newRow("1.000C") << "C" << QString("1.000") << false << ACC;
 
-    QTest::newRow("1,000de") << "de" << QString("1,000") << ACC;
-    QTest::newRow("1.000de") << "de" << QString("1.000") << ACC;
+    QTest::newRow("1,000de") << "de" << QString("1,000") << false << ACC;
+    QTest::newRow("1.000de") << "de" << QString("1.000") << false << ACC;
 
-    QTest::newRow(".C") << "C" << QString(".") << ITM;
-    QTest::newRow(".de") << "de" << QString(".") << INV;
-    QTest::newRow(",C") << "C" << QString(",") << INV;
-    QTest::newRow(",de") << "de" << QString(",") << ITM;
+    QTest::newRow(".C") << "C" << QString(".") << false << ITM;
+    QTest::newRow(".de") << "de" << QString(".") << false << INV;
+    QTest::newRow("1.000,1de") << "de" << QString("1.000,1") << false << ACC;
+    QTest::newRow("1.000,1de_reject") << "de" << QString("1.000,1") << true << INV;
+    QTest::newRow(",C") << "C" << QString(",") << false << INV;
+    QTest::newRow(",de") << "de" << QString(",") << false << ITM;
 }
 
 void tst_QDoubleValidator::validateThouSep()
 {
     QFETCH(QString, localeName);
     QFETCH(QString, value);
+    QFETCH(bool, rejectGroupSeparator);
     QFETCH(QValidator::State, result);
     int dummy = 0;
 
     QDoubleValidator iv(-10000, 10000, 3, 0);
     iv.setNotation(QDoubleValidator::ScientificNotation);
-    iv.setLocale(QLocale(localeName));
+    QLocale locale(localeName);
+    if (rejectGroupSeparator)
+        locale.setNumberOptions(QLocale::RejectGroupSeparator);
+    iv.setLocale(locale);
 
     QCOMPARE(iv.validate(value, dummy), result);
 }