diff --git a/src/providers/postgres/qgspostgresprovider.cpp b/src/providers/postgres/qgspostgresprovider.cpp
index c620d5b197b..d2413a65dbb 100644
--- a/src/providers/postgres/qgspostgresprovider.cpp
+++ b/src/providers/postgres/qgspostgresprovider.cpp
@@ -1676,7 +1676,7 @@ bool QgsPostgresProvider::addFeatures( QgsFeatureList &flist )
         }
         else
         {
-          values += delim + quotedValue( v.toString() );
+          values += delim + quotedValue( v );
         }
       }
       else