diff --git a/src/sql/kernel/qsqlquery.cpp b/src/sql/kernel/qsqlquery.cpp
index 661a582afe..e5f4c5fc56 100644
--- a/src/sql/kernel/qsqlquery.cpp
+++ b/src/sql/kernel/qsqlquery.cpp
@@ -309,19 +309,20 @@ QSqlQuery& QSqlQuery::operator=(const QSqlQuery& other)
 }
 
 /*!
-  Returns \c true if the query is \l{isActive()}{active} and positioned
-  on a valid record and the \a field is NULL; otherwise returns
-  false. Note that for some drivers, isNull() will not return accurate
-  information until after an attempt is made to retrieve data.
+    Returns \c true if the query is not \l{isActive()}{active},
+    the query is not positioned on a valid record,
+    there is no such field, or the field is null; otherwise \c false.
+    Note that for some drivers, isNull() will not return accurate
+    information until after an attempt is made to retrieve data.
 
-  \sa isActive(), isValid(), value()
+    \sa isActive(), isValid(), value()
 */
 
 bool QSqlQuery::isNull(int field) const
 {
-    if (d->sqlResult->isActive() && d->sqlResult->isValid())
-        return d->sqlResult->isNull(field);
-    return true;
+    return !d->sqlResult->isActive()
+             || !d->sqlResult->isValid()
+             || d->sqlResult->isNull(field);
 }
 
 /*!
diff --git a/tests/auto/sql/kernel/qsqlquery/tst_qsqlquery.cpp b/tests/auto/sql/kernel/qsqlquery/tst_qsqlquery.cpp
index 1a100ce706..9098d5b101 100644
--- a/tests/auto/sql/kernel/qsqlquery/tst_qsqlquery.cpp
+++ b/tests/auto/sql/kernel/qsqlquery/tst_qsqlquery.cpp
@@ -1393,6 +1393,9 @@ void tst_QSqlQuery::isNull()
     QVERIFY( q.next() );
     QVERIFY( !q.isNull( 0 ) );
     QVERIFY( !q.isNull( 1 ) );
+
+    // For a non existent field, it should be returning true.
+    QVERIFY(q.isNull(2));
 }
 
 /*! TDS specific BIT field test */