Index: src/providers/postgres/qgspostgresprovider.h
===================================================================
--- src/providers/postgres/qgspostgresprovider.h	(revision 8220)
+++ src/providers/postgres/qgspostgresprovider.h	(working copy)
@@ -69,7 +69,7 @@
     /**
       *   Returns the permanent storage type for this layer as a friendly name.
       */
-    QString storageType();
+    virtual QString storageType() const;
 
     /*! Get the QgsSpatialRefSys for this layer
      * @note Must be reimplemented by each provider. 
Index: src/providers/postgres/qgspostgresprovider.cpp
===================================================================
--- src/providers/postgres/qgspostgresprovider.cpp	(revision 8220)
+++ src/providers/postgres/qgspostgresprovider.cpp	(working copy)
@@ -334,7 +334,7 @@
   connection = 0;
 }
 
-QString QgsPostgresProvider::storageType()
+QString QgsPostgresProvider::storageType() const
 {
   return "PostgreSQL database with PostGIS extension";
 }