diff --git a/src/providers/ogr/qgsogrprovider.cpp b/src/providers/ogr/qgsogrprovider.cpp
index 6c6d3a6ef85..fd177ad5150 100644
--- a/src/providers/ogr/qgsogrprovider.cpp
+++ b/src/providers/ogr/qgsogrprovider.cpp
@@ -1263,11 +1263,14 @@ void QgsOgrProvider::uniqueValues( int index, QList<QVariant> &uniqueValues )
   if ( !fi.exists() )
     return;
 
-  QString sql = QString( "SELECT DISTINCT %1 FROM %2 ORDER BY %1" ).arg( fld.name() ).arg( fi.baseName() );
+  QString sql = QString( "SELECT DISTINCT %1 FROM %2 ORDER BY %1" )
+                .arg( quotedIdentifier( fld.name() ) )
+                .arg( quotedIdentifier( fi.baseName() ) );
 
   uniqueValues.clear();
 
-  OGRLayerH lyr = OGR_DS_ExecuteSQL( ogrDataSource, sql.toAscii(), NULL, "SQL" );
+  QgsDebugMsg( QString( "SQL: %1" ).arg( sql ) );
+  OGRLayerH lyr = OGR_DS_ExecuteSQL( ogrDataSource, mEncoding->fromUnicode( sql ).data(), NULL, "SQL" );
   if ( 0 == lyr )
     return;
 
@@ -1290,9 +1293,11 @@ QVariant QgsOgrProvider::minimumValue( int index )
   if ( !fi.exists() )
     return QVariant();
 
-  QString sql = QString( "SELECT MIN(%1) FROM %2" ).arg( fld.name() ).arg( fi.baseName() );
+  QString sql = QString( "SELECT MIN(%1) FROM %2" )
+                .arg( quotedIdentifier( fld.name() ) )
+                .arg( quotedIdentifier( fi.baseName() ) );
 
-  OGRLayerH l = OGR_DS_ExecuteSQL( ogrDataSource, sql.toAscii(), NULL, "SQL" );
+  OGRLayerH l = OGR_DS_ExecuteSQL( ogrDataSource, mEncoding->fromUnicode( sql ).data(), NULL, "SQL" );
 
   if ( l == 0 )
     return QVariant();
@@ -1319,9 +1324,11 @@ QVariant QgsOgrProvider::maximumValue( int index )
   if ( !fi.exists() )
     return QVariant();
 
-  QString sql = QString( "SELECT MAX(%1) FROM %2" ).arg( fld.name() ).arg( fi.baseName() );
+  QString sql = QString( "SELECT MAX(%1) FROM %2" )
+                .arg( quotedIdentifier( fld.name() ) )
+                .arg( quotedIdentifier( fi.baseName() ) );
 
-  OGRLayerH l = OGR_DS_ExecuteSQL( ogrDataSource, sql.toAscii(), NULL, "SQL" );
+  OGRLayerH l = OGR_DS_ExecuteSQL( ogrDataSource, mEncoding->fromUnicode( sql ).data(), NULL, "SQL" );
   if ( l == 0 )
     return QVariant();
 
@@ -1339,3 +1346,11 @@ QVariant QgsOgrProvider::maximumValue( int index )
 
   return value;
 }
+
+QString QgsOgrProvider::quotedIdentifier( QString field )
+{
+  field.replace( '\\', "\\\\" );
+  field.replace( '"', "\\\"" );
+  field.replace( "'", "\\'" );
+  return field.prepend( "\"" ).append( "\"" );
+}
diff --git a/src/providers/ogr/qgsogrprovider.h b/src/providers/ogr/qgsogrprovider.h
index e5748659600..b60d3638aed 100644
--- a/src/providers/ogr/qgsogrprovider.h
+++ b/src/providers/ogr/qgsogrprovider.h
@@ -251,4 +251,6 @@ class QgsOgrProvider : public QgsVectorDataProvider
     bool addFeature( QgsFeature& f );
     /**Deletes one feature*/
     bool deleteFeature( int id );
+
+    QString quotedIdentifier( QString field );
 };