diff --git a/src/sql/kernel/qsqlerror.cpp b/src/sql/kernel/qsqlerror.cpp
index 1763722e8a..1979e5d1f5 100644
--- a/src/sql/kernel/qsqlerror.cpp
+++ b/src/sql/kernel/qsqlerror.cpp
@@ -107,7 +107,8 @@ QSqlError::QSqlError(const QString& driverText, const QString& databaseText, Err
     d->driverError = driverText;
     d->databaseError = databaseText;
     d->errorType = type;
-    d->errorCode = QString::number(number);
+    if (number != -1)
+        d->errorCode = QString::number(number);
 }
 #endif
 
@@ -287,7 +288,7 @@ void QSqlError::setType(ErrorType type)
 #if QT_DEPRECATED_SINCE(5, 3)
 int QSqlError::number() const
 {
-    return d->errorCode.toInt();
+    return d->errorCode.isEmpty() ? -1 : d->errorCode.toInt();
 }
 #endif
 
diff --git a/src/sql/kernel/qsqlerror.h b/src/sql/kernel/qsqlerror.h
index 4e27ab03ae..679e0f9e3c 100644
--- a/src/sql/kernel/qsqlerror.h
+++ b/src/sql/kernel/qsqlerror.h
@@ -60,15 +60,13 @@ public:
         UnknownError
     };
 #if QT_DEPRECATED_SINCE(5, 3)
-    QSqlError( const QString& driverText = QString(),
-                const QString& databaseText = QString(),
-                ErrorType type = NoError,
-                int number = -1);
+    QT_DEPRECATED QSqlError(const QString &driverText, const QString &databaseText,
+                            ErrorType type, int number);
 #endif
-    QSqlError(const QString &driverText,
-              const QString &databaseText,
-              ErrorType type,
-              const QString &errorCode);
+    QSqlError(const QString &driverText = QString(),
+              const QString &databaseText = QString(),
+              ErrorType type = NoError,
+              const QString &errorCode = QString());
     QSqlError(const QSqlError& other);
     QSqlError& operator=(const QSqlError& other);
     bool operator==(const QSqlError& other) const;
@@ -79,7 +77,7 @@ public:
     QString databaseText() const;
     ErrorType type() const;
 #if QT_DEPRECATED_SINCE(5, 3)
-    int number() const;
+    QT_DEPRECATED int number() const;
 #endif
     QString nativeErrorCode() const;
     QString text() const;
diff --git a/tests/auto/sql/kernel/qsqlerror/tst_qsqlerror.cpp b/tests/auto/sql/kernel/qsqlerror/tst_qsqlerror.cpp
index 9763e3e7e6..847453b3ed 100644
--- a/tests/auto/sql/kernel/qsqlerror/tst_qsqlerror.cpp
+++ b/tests/auto/sql/kernel/qsqlerror/tst_qsqlerror.cpp
@@ -102,6 +102,7 @@ void tst_QSqlError::construction()
    QCOMPARE(obj1.databaseText(), QString("databasetext"));
    QCOMPARE(obj1.type(), QSqlError::UnknownError);
    QCOMPARE(obj1.number(), 123);
+   QCOMPARE(obj1.nativeErrorCode(), QStringLiteral("123"));
    QVERIFY(obj1.isValid());
 
    QSqlError obj2(obj1);
@@ -109,6 +110,7 @@ void tst_QSqlError::construction()
    QCOMPARE(obj2.databaseText(), obj1.databaseText());
    QCOMPARE(obj2.type(), obj1.type());
    QCOMPARE(obj2.number(), obj1.number());
+   QCOMPARE(obj2.nativeErrorCode(), obj1.nativeErrorCode());
    QVERIFY(obj2.isValid());
 
    QSqlError obj3 = obj2;
@@ -116,10 +118,16 @@ void tst_QSqlError::construction()
    QCOMPARE(obj3.databaseText(), obj2.databaseText());
    QCOMPARE(obj3.type(), obj2.type());
    QCOMPARE(obj3.number(), obj2.number());
+   QCOMPARE(obj3.nativeErrorCode(), obj2.nativeErrorCode());
    QVERIFY(obj3.isValid());
 
    QSqlError obj4;
    QVERIFY(!obj4.isValid());
+   QCOMPARE(obj4.driverText(), QString());
+   QCOMPARE(obj4.databaseText(), QString());
+   QCOMPARE(obj4.type(), QSqlError::NoError);
+   QCOMPARE(obj4.number(), -1);
+   QCOMPARE(obj4.nativeErrorCode(), QString());
 
    QSqlError obj5(QStringLiteral("drivertext"), QStringLiteral("databasetext"),
                   QSqlError::UnknownError, QStringLiteral("123"));
@@ -138,6 +146,16 @@ void tst_QSqlError::construction()
    QCOMPARE(obj6.number(), 0);
    QCOMPARE(obj6.nativeErrorCode(), QStringLiteral("Err123"));
    QVERIFY(obj6.isValid());
+
+   // Default constructed object as constructed before Qt 5.3
+   QSqlError obj7(QString(), QString(), QSqlError::NoError, -1);
+   QVERIFY(!obj7.isValid());
+   QCOMPARE(obj7.driverText(), QString());
+   QCOMPARE(obj7.databaseText(), QString());
+   QCOMPARE(obj7.type(), QSqlError::NoError);
+   QCOMPARE(obj7.number(), -1);
+   QCOMPARE(obj7.nativeErrorCode(), QString());
+
 }
 
 void tst_QSqlError::operators()