diff --git a/src/providers/memory/qgsmemoryprovider.cpp b/src/providers/memory/qgsmemoryprovider.cpp
index 3adc1770dfe..90080ceee0d 100644
--- a/src/providers/memory/qgsmemoryprovider.cpp
+++ b/src/providers/memory/qgsmemoryprovider.cpp
@@ -451,6 +451,7 @@ void QgsMemoryProvider::updateExtent()
   }
   else
   {
+    mExtent.setMinimal();
     Q_FOREACH( const QgsFeature& feat, mFeatures )
     {
       if ( feat.geometry() )