diff --git a/src/core/qgsfield.cpp b/src/core/qgsfield.cpp
index 3f98cc18df0..e8ba21b1fcc 100644
--- a/src/core/qgsfield.cpp
+++ b/src/core/qgsfield.cpp
@@ -285,8 +285,8 @@ bool QgsField::convertCompatible( QVariant &v ) const
     if ( !tmp.convert( d->type ) )
     {
       // This might be a string with thousand separator: use locale to convert
-      bool ok;
-      double d = QLocale().toDouble( v.toString(), &ok );
+      bool ok = false;
+      double d = qgsPermissiveToDouble( v.toString(), ok );
       if ( ok )
       {
         v = QVariant( d );
@@ -295,7 +295,7 @@ bool QgsField::convertCompatible( QVariant &v ) const
       // For not 'dot' locales, we also want to accept '.'
       if ( QLocale().decimalPoint() != '.' )
       {
-        d = QLocale( QLocale::English ).toDouble( v.toString(), &ok );
+        d = QLocale( QLocale::C ).toDouble( v.toString(), &ok );
         if ( ok )
         {
           v = QVariant( d );
@@ -313,7 +313,7 @@ bool QgsField::convertCompatible( QVariant &v ) const
     {
       // This might be a string with thousand separator: use locale to convert
       bool ok;
-      int i = QLocale().toInt( v.toString(), &ok );
+      int i = qgsPermissiveToInt( v.toString(), ok );
       if ( ok )
       {
         v = QVariant( i );
@@ -330,7 +330,7 @@ bool QgsField::convertCompatible( QVariant &v ) const
     {
       // This might be a string with thousand separator: use locale to convert
       bool ok;
-      qlonglong l = QLocale().toLongLong( v.toString(), &ok );
+      qlonglong l = qgsPermissiveToLongLong( v.toString(), ok );
       if ( ok )
       {
         v = QVariant( l );
diff --git a/tests/src/core/testqgsfield.cpp b/tests/src/core/testqgsfield.cpp
index 86b94ea6be2..92b7d768d06 100644
--- a/tests/src/core/testqgsfield.cpp
+++ b/tests/src/core/testqgsfield.cpp
@@ -607,6 +607,14 @@ void TestQgsField::convertCompatible()
   QCOMPARE( stringDouble.type(), QVariant::Double );
   QCOMPARE( stringDouble, QVariant( 1223456.012345 ) );
 
+  // Test that wrongly formatted decimal separator are also accepted
+  QLocale::setDefault( QLocale::German );
+  QCOMPARE( QLocale().groupSeparator(), '.' );
+  QCOMPARE( QLocale().decimalPoint(), ',' );
+  stringDouble = QVariant( "12.23.456,012345" );
+  QVERIFY( doubleField.convertCompatible( stringDouble ) );
+  QCOMPARE( stringDouble.type(), QVariant::Double );
+  QCOMPARE( stringDouble, QVariant( 1223456.012345 ) );
 
 }