diff --git a/Rendering/Core/vtkViewport.cxx b/Rendering/Core/vtkViewport.cxx
index 95bba04dfc9fe9a96b51d2c8d165cb4257136f2c..a4d6edcf5f8ed2c55378450eef13e3409a29e02c 100644
--- a/Rendering/Core/vtkViewport.cxx
+++ b/Rendering/Core/vtkViewport.cxx
@@ -93,6 +93,10 @@ vtkViewport::vtkViewport()
 
   this->Props = vtkPropCollection::New();
   this->Actors2D = vtkActor2DCollection::New();
+
+  this->LastComputeAspectSize.fill(-1);
+  this->LastComputeAspectVPort.fill(-1);
+  this->LastComputeAspectPixelAspect.fill(-1);
 }
 
 //------------------------------------------------------------------------------